diff --git a/Driver.cpp b/Driver.cpp
index 1e32858b..9a78bb68 100644
--- a/Driver.cpp
+++ b/Driver.cpp
@@ -3080,8 +3080,8 @@ bool TController::DecBrakeEIM()
 
 bool TController::IncSpeed()
 { // zwiększenie prędkości; zwraca false, jeśli dalej się nie da zwiększać
-    if( true == tsGuardSignal.is_playing() ) {
-        // jeśli gada, to nie jedziemy
+    if( fActionTime < 0.0 ) {
+        // gdy jest nakaz poczekać z jazdą, to nie ruszać
         return false;
     }
     bool OK = true;
@@ -3093,6 +3093,7 @@ bool TController::IncSpeed()
 	if (mvOccupied->SpringBrake.IsActive && mvOccupied->SpringBrake.Activate) {
 		mvOccupied->SpringBrakeActivate(false);
 	}
+    // Doors() call can potentially adjust fActionTime
     if( fActionTime < 0.0 ) {
         // gdy jest nakaz poczekać z jazdą, to nie ruszać
         return false;
@@ -5717,6 +5718,8 @@ TController::UpdateSituation(double dt) {
                         // place virtual conductor some distance away
                         tsGuardSignal.offset( { pVehicle->MoverParameters->Dim.W * -0.75f, 1.7f, std::min( -20.0, -0.2 * fLength ) } );
                         tsGuardSignal.play( sound_flags::exclusive );
+                        // NOTE: we can't rely on is_playing() check as sound playback is based on distance from local camera
+                        fActionTime = -5.0; // niech trochę potrzyma
                     }
                     else {
                         // if (iGuardRadio==iRadioChannel) //zgodność kanału
@@ -5727,6 +5730,8 @@ TController::UpdateSituation(double dt) {
                         tsGuardSignal.owner( pVehicle );
                         tsGuardSignal.offset( { 0.f, 2.f, pVehicle->MoverParameters->Dim.L * 0.4f * ( pVehicle->MoverParameters->CabOccupied < 0 ? -1 : 1 ) } );
                         tsGuardSignal.play( sound_flags::exclusive );
+                        // NOTE: we can't rely on is_playing() check as sound playback is based on distance from local camera
+                        fActionTime = -5.0; // niech trochę potrzyma
                     }
                 }
             }
@@ -6984,7 +6989,7 @@ void TController::UpdateDelayFlag() {
 
 void TController::TakeControl( bool const Aidriver, bool const Forcevehiclecheck )
 { // przejęcie kontroli przez AI albo oddanie
-    if (AIControllFlag == Aidriver)
+    if ((AIControllFlag == Aidriver) && (!Forcevehiclecheck))
         return; // już jest jak ma być
     if (Aidriver) //żeby nie wykonywać dwa razy
     { // teraz AI prowadzi
@@ -7145,12 +7150,29 @@ TController::TrackBlock() const {
 
 void TController::MoveTo(TDynamicObject *to)
 { // przesunięcie AI do innego pojazdu (przy zmianie kabiny)
-    // mvOccupied->CabDeactivisation(); //wyłączenie kabiny w opuszczanym
-    pVehicle->Mechanik = to->Mechanik; //żeby się zamieniły, jak jest jakieś drugie
+    if( ( to->Mechanik != nullptr )
+     && ( to->Mechanik != this ) ) {
+        // ai controller thunderdome, there can be only one
+        if( to->Mechanik->AIControllFlag ) {
+            if( to->Mechanik->primary() ) {
+                // take over boss duties
+                primary( true );
+            }
+            SafeDelete( to->Mechanik );
+        }
+        else {
+            // can't quite delete a human
+            if( AIControllFlag ) {
+                delete this;
+            }
+            return;
+        }
+    }
+    pVehicle->Mechanik = nullptr;
     pVehicle = to;
     ControllingSet(); // utworzenie połączenia do sterowanego pojazdu
     pVehicle->Mechanik = this;
-    // iDirection=0; //kierunek jazdy trzeba dopiero zgadnąć
+
 };
 
 void TController::ControllingSet()
diff --git a/DynObj.cpp b/DynObj.cpp
index 625d94da..23dda44b 100644
--- a/DynObj.cpp
+++ b/DynObj.cpp
@@ -2220,17 +2220,6 @@ TDynamicObject::create_controller( std::string const Type, bool const Trainset )
 
     if( Type == "" ) { return; }
 
-    if( asName == Global.local_start_vehicle ) {
-        // jeśli pojazd wybrany do prowadzenia
-        if( MoverParameters->EngineType != TEngineType::Dumb ) {
-            // wsadzamy tam sterującego
-            Controller = Humandriver;
-        }
-        else {
-            // w przeciwnym razie trzeba włączyć pokazywanie kabiny
-            bDisplayCab = true;
-        }
-    }
     // McZapkie-151102: rozkład jazdy czytany z pliku *.txt z katalogu w którym jest sceneria
     if( ( Type == "1" )
      || ( Type == "2" ) ) {
@@ -5539,8 +5528,8 @@ void TDynamicObject::LoadMMediaFile( std::string const &TypeName, std::string co
                     for( auto &bogie : m_bogiesounds ) {
                         bogie.start( (
                             bogieidx % 2 ?
-                                Random(  0.0, 30.0 ) :
-                                Random( 50.0, 80.0 ) )
+                                LocalRandom(  0.0, 30.0 ) :
+                                LocalRandom( 50.0, 80.0 ) )
                             * 0.01 );
                         ++bogieidx;
                     }
diff --git a/Globals.h b/Globals.h
index cf04b051..a30a2697 100644
--- a/Globals.h
+++ b/Globals.h
@@ -33,7 +33,6 @@ struct global_settings {
 	bool ready_to_load { false };
 	std::time_t starting_timestamp = 0; // starting time, in local timezone
 	uint32_t random_seed = 0;
-    TDynamicObject *changeDynObj{ nullptr };// info o zmianie pojazdu
     TCamera pCamera; // parametry kamery
     TCamera pDebugCamera;
     std::array<Math3D::vector3, 10> FreeCameraInit; // pozycje kamery
diff --git a/Names.h b/Names.h
index 178d82e4..b3f59303 100644
--- a/Names.h
+++ b/Names.h
@@ -58,13 +58,6 @@ public:
 
 		m_itemmap.erase(lookup);
 	}
-	uint32_t find_id( std::string const &Name) const {
-		auto lookup = m_itemmap.find( Name );
-		return (
-		    lookup != m_itemmap.end() ?
-		        lookup->second :
-		        -1 );
-	}
 	void purge (Type_ *Item)
 	{
 		for (auto it = m_items.begin(); it != m_items.end(); it++) {
diff --git a/Train.cpp b/Train.cpp
index d828d438..cd95447e 100644
--- a/Train.cpp
+++ b/Train.cpp
@@ -5827,7 +5827,7 @@ bool TTrain::Update( double const Deltatime )
             if (ff != fTachoTimer) // jesli w tej sekundzie nie zmienial
             {
                 if (fTachoVelocity > 1) // jedzie
-                    fTachoVelocityJump = fTachoVelocity + (2.0 - Random(3) + Random(3)) * 0.5;
+                    fTachoVelocityJump = fTachoVelocity + (2.0 - LocalRandom(3) + LocalRandom(3)) * 0.5;
                 else
                     fTachoVelocityJump = 0; // stoi
                 fTachoTimer = ff; // juz zmienil
@@ -6049,7 +6049,8 @@ bool TTrain::Update( double const Deltatime )
             if ((mvControlled->CompressorFlag == true) && (mvControlled->CompressorPower == 1) &&
                 ((mvControlled->EngineType == TEngineType::ElectricSeriesMotor) ||
                  (mvControlled->TrainType == dt_EZT)) &&
-                (DynamicObject->Controller == Humandriver)) // hunter-110212: poprawka dla EZT
+                (DynamicObject->Controller == Humandriver) // hunter-110212: poprawka dla EZT
+                && ( false == DynamicObject->Mechanik->AIControllFlag ) )
             { // hunter-091012: poprawka (zmiana warunku z CompressorPower /rozne od 0/ na /rowne 1/)
                 if (fConverterTimer < fConverterPrzekaznik)
                 {
@@ -7496,6 +7497,9 @@ bool TTrain::InitializeCab(int NewCabNo, std::string const &asFileName)
     }
     // reset view angles
     pMechViewAngle = { 0.0, 0.0 };
+
+    is_cab_initialized = true; // the attempt may fail, but it's the attempt that counts
+
     bool parse = false;
     int cabindex = 0;
     DynamicObject->mdKabina = NULL; // likwidacja wskaźnika na dotychczasową kabinę
@@ -7871,7 +7875,6 @@ TTrain::MoveToVehicle(TDynamicObject *target) {
 	// > Ra: to nie może być tak robione, to zbytnia proteza jest
 	// indeed, too much hacks...
 	// TODO: cleanup
-
 	TTrain *target_train = simulation::Trains.find(target->name());
 	if (target_train) {
 		// let's try to destroy this TTrain and move to already existing one
@@ -7882,18 +7885,22 @@ TTrain::MoveToVehicle(TDynamicObject *target) {
 			Occupied()->CabDeactivisation();
 			Occupied()->CabOccupied = 0;
 			Occupied()->BrakeLevelSet(Occupied()->Handle->GetPos(bh_NP)); //rozwala sterowanie hamulcem GF 04-2016
-			Dynamic()->MechInside = false;
+            Occupied()->MainCtrlPos = Occupied()->MainCtrlNoPowerPos();
+            Occupied()->ScndCtrlPos = 0;
+            Dynamic()->MechInside = false;
 			Dynamic()->Controller = AIdriver;
 
 			Dynamic()->bDisplayCab = false;
 			Dynamic()->ABuSetModelShake( {} );
 
-			Dynamic()->Mechanik->MoveTo(target);
+            if( Dynamic()->Mechanik ) {
+                Dynamic()->Mechanik->MoveTo( target );
+            }
 
 			target_train->Occupied()->LimPipePress = target_train->Occupied()->PipePress;
-			target_train->Occupied()->CabActivisation(); // załączenie rozrządu (wirtualne kabiny)
+			target_train->Occupied()->CabActivisation( true ); // załączenie rozrządu (wirtualne kabiny)
 			target_train->Dynamic()->MechInside = true;
-			target_train->Dynamic()->Controller = Humandriver;
+			target_train->Dynamic()->Controller = ( target_train->Dynamic()->Mechanik ? !target_train->Dynamic()->Mechanik->AIControllFlag : Humandriver );
 		} else {
 			target_train->Dynamic()->bDisplayCab = false;
 			target_train->Dynamic()->ABuSetModelShake( {} );
@@ -7922,20 +7929,24 @@ TTrain::MoveToVehicle(TDynamicObject *target) {
 			Occupied()->CabDeactivisation();
 			Occupied()->CabOccupied = 0;
 			Occupied()->BrakeLevelSet(Occupied()->Handle->GetPos(bh_NP)); //rozwala sterowanie hamulcem GF 04-2016
-			Dynamic()->MechInside = false;
+            Occupied()->MainCtrlPos = Occupied()->MainCtrlNoPowerPos();
+            Occupied()->ScndCtrlPos = 0;
+            Dynamic()->MechInside = false;
 			Dynamic()->Controller = AIdriver;
 
 			Dynamic()->bDisplayCab = false;
 			Dynamic()->ABuSetModelShake( {} );
 
-			Dynamic()->Mechanik->MoveTo(target);
+            if( Dynamic()->Mechanik ) {
+                Dynamic()->Mechanik->MoveTo( target );
+            }
 
 			DynamicSet(target);
 
 			Occupied()->LimPipePress = Occupied()->PipePress;
-			Occupied()->CabActivisation(); // załączenie rozrządu (wirtualne kabiny)
+			Occupied()->CabActivisation( true ); // załączenie rozrządu (wirtualne kabiny)
 			Dynamic()->MechInside = true;
-			Dynamic()->Controller = Humandriver;
+			Dynamic()->Controller = ( Dynamic()->Mechanik ? !Dynamic()->Mechanik->AIControllFlag : Humandriver );
 		} else {
 			Dynamic()->bDisplayCab = false;
 			Dynamic()->ABuSetModelShake( {} );
@@ -7953,6 +7964,7 @@ TTrain::MoveToVehicle(TDynamicObject *target) {
 		// add it back with updated dynamic name
 		simulation::Trains.insert(this);
 	}
+
 }
 
 // checks whether specified point is within boundaries of the active cab
@@ -8302,7 +8314,7 @@ void TTrain::set_cab_controls( int const Cab ) {
     if( true == mvOccupied->Radio ) {
         ggRadioButton.PutValue( 1.f );
     }
-    ggRadioChannelSelector.PutValue( RadioChannel() - 1 );
+    ggRadioChannelSelector.PutValue( ( Dynamic()->Mechanik ? Dynamic()->Mechanik->iRadioChannel : 1 ) - 1 );
     // pantographs
 /*
     if( mvOccupied->PantSwitchType != "impulse" ) {
@@ -9262,3 +9274,19 @@ void train_table::update(double dt)
 		}
 	}
 }
+
+TTrain *
+train_table::find_id( std::uint16_t const Id ) const {
+
+    if( Id == 0 ) { return nullptr; }
+
+    for( TTrain *train : m_items ) {
+        if( !train ) {
+            continue;
+        }
+        if( train->id() == Id ) {
+            return train;
+        }
+    }
+    return nullptr;
+}
diff --git a/Train.h b/Train.h
index 49ccfe84..9edafb78 100644
--- a/Train.h
+++ b/Train.h
@@ -716,6 +716,7 @@ public: // reszta może by?publiczna
     // McZapkie: opis kabiny - obszar poruszania sie mechanika oraz zajetosc
     std::array<TCab, 3> Cabine; // przedzial maszynowy, kabina 1 (A), kabina 2 (B)
     int iCabn { 0 }; // 0: mid, 1: front, 2: rear
+    bool is_cab_initialized { false };
     // McZapkie: do poruszania sie po kabinie
     Math3D::vector3 pMechSittingPosition; // ABu 180404
     Math3D::vector3 MirrorPosition( bool lewe );
@@ -773,7 +774,7 @@ private:
 	float fDieselParams[9][10]; // parametry dla silnikow asynchronicznych
     // plays provided sound from position of the radio
     void radio_message( sound_source *Message, int const Channel );
-    inline auto const &RadioChannel() const { return Dynamic()->Mechanik->iRadioChannel; }
+    inline auto const RadioChannel() const { return ( Dynamic()->Mechanik ? Dynamic()->Mechanik->iRadioChannel : 1 ); }
     inline auto &RadioChannel() { return Dynamic()->Mechanik->iRadioChannel; }
     inline TDynamicObject *Dynamic() { return DynamicObject; };
     inline TDynamicObject const *Dynamic() const { return DynamicObject; };
@@ -794,6 +795,7 @@ private:
 class train_table : public basic_table<TTrain> {
 public:
     void update( double dt );
+    TTrain *find_id( std::uint16_t const Id ) const;
 };
 
 //---------------------------------------------------------------------------
diff --git a/application.cpp b/application.cpp
index 71b146e1..dd8fee7e 100644
--- a/application.cpp
+++ b/application.cpp
@@ -167,13 +167,26 @@ void eu07_application::queue_quit() {
 	glfwSetWindowShouldClose(m_windows[0], GLFW_TRUE);
 }
 
+bool
+eu07_application::is_server() const {
+
+    return ( m_network && m_network->servers );
+}
+
+bool
+eu07_application::is_client() const {
+
+    return ( m_network && m_network->client );
+}
+
 int
 eu07_application::run() {
-
+    auto frame{ 0 };
     // main application loop
     while (!glfwWindowShouldClose( m_windows.front() ) && !m_modestack.empty())
     {
         Timer::subsystem.mainloop_total.start();
+        glfwPollEvents();
 
 		// -------------------------------------------------------------------
 		// multiplayer command relaying logic can seem a bit complex
@@ -191,6 +204,9 @@ eu07_application::run() {
 			int loop_remaining = MAX_NETWORK_PER_FRAME;
 			while (--loop_remaining > 0)
 			{
+#ifdef EU07_DEBUG_NETSYNC
+                WriteLog( "net: frame " + std::to_string(++frame) + " start", logtype::net );
+#endif
 				command_queue::commands_map commands_to_exec;
 				command_queue::commands_map local_commands = simulation::Commands.pop_intercept_queue();
 				double slave_sync;
@@ -272,7 +288,7 @@ eu07_application::run() {
 				float awaiting = m_network->client->get_awaiting_frames();
 
 				// TODO: don't meddle with mode progresbar
-				m_modes[m_modestack.top()]->set_progress(100.0f, 100.0f * (received - awaiting) / received);
+				m_modes[m_modestack.top()]->set_progress(100.0f * (received - awaiting) / received);
 			} else {
 				m_modes[m_modestack.top()]->set_progress(0.0f, 0.0f);
 			}
@@ -295,8 +311,6 @@ eu07_application::run() {
         if (!GfxRenderer->Render())
             return 0;
 
-        glfwPollEvents();
-
         if (m_modestack.empty())
             return 0;
 
diff --git a/application.h b/application.h
index f2006c07..8145cf75 100644
--- a/application.h
+++ b/application.h
@@ -92,6 +92,10 @@ public:
 	    generate_sync();
 	void
 	    queue_quit();
+    bool
+        is_server() const;
+    bool
+        is_client() const;
 
 private:
 // types
diff --git a/command.cpp b/command.cpp
index d40a1018..241d05ce 100644
--- a/command.cpp
+++ b/command.cpp
@@ -386,7 +386,7 @@ command_relay::post(user_command const Command, double const Param1, double cons
 		Position = Global.pCamera.Pos;
 
 	uint32_t combined_recipient = static_cast<uint32_t>( command.target ) | Recipient;
-	command_data commanddata({Command, Action, Param1, Param2, Timer::GetDeltaTime(), FreeFlyModeFlag, Position });
+	command_data commanddata({Command, Action, Param1, Param2, Timer::GetDeltaTime(), Position });
 	if (Payload)
 		commanddata.payload = *Payload;
 
diff --git a/command.h b/command.h
index 215bd3ad..1073cbb2 100644
--- a/command.h
+++ b/command.h
@@ -324,7 +324,6 @@ struct command_data {
     double param2;
     double time_delta;
 
-    bool freefly;
     glm::vec3 location;
 
     std::string payload;
diff --git a/drivermode.cpp b/drivermode.cpp
index 007f5379..437c5e08 100644
--- a/drivermode.cpp
+++ b/drivermode.cpp
@@ -17,6 +17,7 @@ http://mozilla.org/MPL/2.0/.
 #include "simulation.h"
 #include "simulationtime.h"
 #include "simulationenvironment.h"
+#include "scene.h"
 #include "lightarray.h"
 #include "particles.h"
 #include "Train.h"
@@ -146,129 +147,119 @@ driver_mode::update() {
 
     double const deltatime = Timer::GetDeltaTime(); // 0.0 gdy pauza
 
-    if( Global.iPause == 0 ) {
-        // jak pauza, to nie ma po co tego przeliczać
-        simulation::Time.update( deltatime );
-    }
     simulation::State.update_clocks();
     simulation::State.update_scripting_interface();
     simulation::Environment.update();
 
+	if (deltatime != 0.0)
+	{
+        // jak pauza, to nie ma po co tego przeliczać
+        simulation::Time.update( deltatime );
+
     // fixed step, simulation time based updates
-//  m_primaryupdateaccumulator += dt; // unused for the time being
-    m_secondaryupdateaccumulator += deltatime;
-/*
-    // NOTE: until we have no physics state interpolation during render, we need to rely on the old code,
-    // as doing fixed step calculations but flexible step render results in ugly mini jitter
-    // core routines (physics)
-    int updatecount = 0;
-    while( ( m_primaryupdateaccumulator >= m_primaryupdaterate )
-         &&( updatecount < 20 ) ) {
-        // no more than 20 updates per single pass, to keep physics from hogging up all run time
-        Ground.Update( m_primaryupdaterate, 1 );
-        ++updatecount;
-        m_primaryupdateaccumulator -= m_primaryupdaterate;
-    }
-*/
-    int updatecount = 1;
-    if( deltatime > m_primaryupdaterate ) // normalnie 0.01s
-    {
-/*
-        // NOTE: experimentally disabled physics update cap
-        auto const iterations = std::ceil(dt / m_primaryupdaterate);
-        updatecount = std::min( 20, static_cast<int>( iterations ) );
-*/
-        updatecount = std::ceil( deltatime / m_primaryupdaterate );
-/*
-        // NOTE: changing dt wrecks things further down the code. re-acquire proper value later or cleanup here
-        dt = dt / iterations; // Ra: fizykę lepiej by było przeliczać ze stałym krokiem
-*/
-    }
-    auto const stepdeltatime { deltatime / updatecount };
-    // NOTE: updates are limited to 20, but dt is distributed over potentially many more iterations
-    // this means at count > 20 simulation and render are going to desync. is that right?
-    // NOTE: experimentally changing this to prevent the desync.
-    // TODO: test what happens if we hit more than 20 * 0.01 sec slices, i.e. less than 5 fps
-    Timer::subsystem.sim_dynamics.start();
-    if( true == Global.FullPhysics ) {
-        // mixed calculation mode, steps calculated in ~0.05s chunks
-        while( updatecount >= 5 ) {
-            simulation::State.update( stepdeltatime, 5 );
-            updatecount -= 5;
-        }
-        if( updatecount ) {
-            simulation::State.update( stepdeltatime, updatecount );
-        }
-    }
-    else {
-        // simplified calculation mode; faster but can lead to errors
-        simulation::State.update( stepdeltatime, updatecount );
-    }
-    Timer::subsystem.sim_dynamics.stop();
-
-    // secondary fixed step simulation time routines
-    while( m_secondaryupdateaccumulator >= m_secondaryupdaterate ) {
-
-        // awaria PoKeys mogła włączyć pauzę - przekazać informację
-        if( Global.iMultiplayer ) // dajemy znać do serwera o wykonaniu
-            if( iPause != Global.iPause ) { // przesłanie informacji o pauzie do programu nadzorującego
-                multiplayer::WyslijParam( 5, 3 ); // ramka 5 z czasem i stanem zapauzowania
-                iPause = Global.iPause;
-            }
-
-        // TODO: generic shake update pass for vehicles within view range
-        if( Camera.m_owner != nullptr ) {
-            Camera.m_owner->update_shake( m_secondaryupdaterate );
-        }
-
-        m_secondaryupdateaccumulator -= m_secondaryupdaterate; // these should be inexpensive enough we have no cap
-    }
-
-    // variable step simulation time routines
-
-    if (!change_train.empty()) {
-		TTrain *train = simulation::Trains.find(change_train);
-		if (train) {
-			simulation::Train = train;
-			InOutKey();
-			m_relay.post(user_command::aidriverdisable, 0.0, 0.0, GLFW_PRESS, 0);
-			change_train.clear();
+	//  m_primaryupdateaccumulator += dt; // unused for the time being
+		m_secondaryupdateaccumulator += deltatime;
+	/*
+		// NOTE: until we have no physics state interpolation during render, we need to rely on the old code,
+		// as doing fixed step calculations but flexible step render results in ugly mini jitter
+		// core routines (physics)
+		int updatecount = 0;
+		while( ( m_primaryupdateaccumulator >= m_primaryupdaterate )
+			 &&( updatecount < 20 ) ) {
+			// no more than 20 updates per single pass, to keep physics from hogging up all run time
+			Ground.Update( m_primaryupdaterate, 1 );
+			++updatecount;
+			m_primaryupdateaccumulator -= m_primaryupdaterate;
 		}
+	*/
+		int updatecount = 1;
+		if( deltatime > m_primaryupdaterate ) // normalnie 0.01s
+		{
+	/*
+			// NOTE: experimentally disabled physics update cap
+			auto const iterations = std::ceil(dt / m_primaryupdaterate);
+			updatecount = std::min( 20, static_cast<int>( iterations ) );
+	*/
+			updatecount = std::ceil( deltatime / m_primaryupdaterate );
+	/*
+			// NOTE: changing dt wrecks things further down the code. re-acquire proper value later or cleanup here
+			dt = dt / iterations; // Ra: fizykę lepiej by było przeliczać ze stałym krokiem
+	*/
+		}
+		auto const stepdeltatime { deltatime / updatecount };
+		// NOTE: updates are limited to 20, but dt is distributed over potentially many more iterations
+		// this means at count > 20 simulation and render are going to desync. is that right?
+		// NOTE: experimentally changing this to prevent the desync.
+		// TODO: test what happens if we hit more than 20 * 0.01 sec slices, i.e. less than 5 fps
+		Timer::subsystem.sim_dynamics.start();
+		if( true == Global.FullPhysics ) {
+			// mixed calculation mode, steps calculated in ~0.05s chunks
+			while( updatecount >= 5 ) {
+				simulation::State.update( stepdeltatime, 5 );
+				updatecount -= 5;
+			}
+			if( updatecount ) {
+				simulation::State.update( stepdeltatime, updatecount );
+			}
+		}
+		else {
+			// simplified calculation mode; faster but can lead to errors
+			simulation::State.update( stepdeltatime, updatecount );
+		}
+		Timer::subsystem.sim_dynamics.stop();
+
+		// secondary fixed step simulation time routines
+		while( m_secondaryupdateaccumulator >= m_secondaryupdaterate ) {
+
+			// awaria PoKeys mogła włączyć pauzę - przekazać informację
+			if( Global.iMultiplayer ) // dajemy znać do serwera o wykonaniu
+				if( iPause != Global.iPause ) { // przesłanie informacji o pauzie do programu nadzorującego
+					multiplayer::WyslijParam( 5, 3 ); // ramka 5 z czasem i stanem zapauzowania
+					iPause = Global.iPause;
+				}
+
+			// TODO: generic shake update pass for vehicles within view range
+			if( Camera.m_owner != nullptr ) {
+				Camera.m_owner->update_shake( m_secondaryupdaterate );
+			}
+
+			m_secondaryupdateaccumulator -= m_secondaryupdaterate; // these should be inexpensive enough we have no cap
+		}
+
+		// variable step simulation time routines
+
+		if (!change_train.empty()) {
+			TTrain *train = simulation::Trains.find(change_train);
+			if (train) {
+                Global.local_start_vehicle = change_train;
+				simulation::Train = train;
+				InOutKey();
+				m_relay.post(user_command::aidriverdisable, 0.0, 0.0, GLFW_PRESS, 0);
+				change_train.clear();
+			}
+		}
+
+		if( ( simulation::Train == nullptr ) && ( false == FreeFlyModeFlag ) ) {
+			// intercept cases when the driven train got removed after entering portal
+			InOutKey();
+		}
+
+		if (!FreeFlyModeFlag && simulation::Train->Dynamic() != Camera.m_owner) {
+			// fixup camera after vehicle switch
+			CabView();
+		}
+
+		if( simulation::Train != nullptr )
+			TSubModel::iInstance = reinterpret_cast<std::uintptr_t>( simulation::Train->Dynamic() );
+		else
+			TSubModel::iInstance = 0;
+
+		simulation::Trains.update(deltatime);
+		simulation::Events.update();
+		simulation::Region->update_events();
+		simulation::Lights.update();
 	}
 
-    if( ( simulation::Train == nullptr ) && ( false == FreeFlyModeFlag ) ) {
-        // intercept cases when the driven train got removed after entering portal
-        InOutKey();
-    }
-
-   	if (!FreeFlyModeFlag && simulation::Train->Dynamic() != Camera.m_owner) {
-		// fixup camera after vehicle switch
-		CabView();
-	}
-/*
-    if( Global.changeDynObj ) {
-        // ABu zmiana pojazdu - przejście do innego
-        ChangeDynamic();
-        // move inside, but only if the human is in charge (otherwise we'll get pulled in when ai switches cabs)
-        if( ( simulation::Train != nullptr )
-         && ( simulation::Train->Dynamic() != nullptr )
-         && ( simulation::Train->Dynamic()->Mechanik != nullptr )
-         && ( simulation::Train->Dynamic()->Mechanik->AIControllFlag == false )
-         && ( true == FreeFlyModeFlag ) ) {
-            InOutKey();
-        }
-    }
-*/
-	if( simulation::Train != nullptr )
-		TSubModel::iInstance = reinterpret_cast<std::uintptr_t>( simulation::Train->Dynamic() );
-	else
-		TSubModel::iInstance = 0;
-
-	simulation::Trains.update(deltatime);
-    simulation::Events.update();
-    simulation::Region->update_events();
-    simulation::Lights.update();
-
     // render time routines follow:
 
     auto const deltarealtime = Timer::GetDeltaRenderTime(); // nie uwzględnia pauzowania ani mnożenia czasu
@@ -359,10 +350,10 @@ driver_mode::update() {
     // NOTE: particle system runs on simulation time, but needs actual camera position to determine how to update each particle source
     simulation::Particles.update();
 
-    simulation::is_ready = true;
-
     GfxRenderer->Update( deltarealtime );
 
+    simulation::is_ready = simulation::is_ready || ( ( simulation::Train != nullptr ) && ( simulation::Train->is_cab_initialized ) ) || ( Global.local_start_vehicle == "ghostview" );
+
     return true;
 }
 
@@ -375,27 +366,24 @@ driver_mode::enter() {
             simulation::Vehicles.find( Global.local_start_vehicle ) :
             nullptr ) };
 
-    Camera.Init(Global.FreeCameraInit[0], Global.FreeCameraInitAngle[0], nPlayerTrain );
+	Camera.Init(Global.FreeCameraInit[0], Global.FreeCameraInitAngle[0], nullptr );
     Global.pCamera = Camera;
-    Global.pDebugCamera = DebugCamera;
+	Global.pDebugCamera = DebugCamera;
+
+	FreeFlyModeFlag = true;
+	DebugCamera = Camera;
 
     if (nPlayerTrain)
     {
 		WriteLog( "Trying to enter player train, \"" + Global.local_start_vehicle + "\"" );
 
-        FreeFlyModeFlag = true; // HACK: entervehicle won't work if the simulation thinks we're outside
-        m_relay.post(user_command::entervehicle, 0.0, 0.0, GLFW_PRESS, 0, nPlayerTrain->GetPosition());
+		m_relay.post(user_command::entervehicle, 0.0, 0.0, GLFW_PRESS, 0, nPlayerTrain->GetPosition(), &Global.local_start_vehicle );
 		change_train = nPlayerTrain->name();
     }
-    else
+	else if (Global.local_start_vehicle != "ghostview")
     {
-        if (Global.local_start_vehicle != "ghostview")
-        {
-            Error("Bad scenario: failed to locate player train, \"" + Global.local_start_vehicle + "\"" );
-        }
-        FreeFlyModeFlag = true; // Ra: automatycznie włączone latanie
-        Camera.m_owner = nullptr;
-        DebugCamera = Camera;
+        Global.local_start_vehicle = "ghostview";
+        Error("Bad scenario: failed to locate player train, \"" + Global.local_start_vehicle + "\"" );
     }
 
     // if (!Global.bMultiplayer) //na razie włączone
@@ -430,8 +418,10 @@ driver_mode::on_key( int const Key, int const Scancode, int const Action, int co
     Global.ctrlState = ( Mods & GLFW_MOD_CONTROL ) ? true : false;
     Global.altState = ( Mods & GLFW_MOD_ALT ) ? true : false;
 
+    bool anyModifier = Mods & (GLFW_MOD_SHIFT | GLFW_MOD_CONTROL | GLFW_MOD_ALT);
+
     // give the ui first shot at the input processing...
-    if( true == m_userinterface->on_key( Key, Scancode, Action, Mods ) ) { return; }
+    if( !anyModifier && true == m_userinterface->on_key( Key, Scancode, Action, Mods ) ) { return; }
     // ...if the input is left untouched, pass it on
     if( true == m_input.keyboard.key( Key, Action ) ) { return; }
 
@@ -529,9 +519,9 @@ driver_mode::update_camera( double const Deltatime ) {
                     Camera.LookAt = controlled->GetPosition() + 0.4 * controlled->VectorUp() * controlled->MoverParameters->Dim.H;
                 }
                 else {
-                    TDynamicObject *d = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Global.pCamera.Pos, 300, false, false ) );
+                    TDynamicObject *d = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Camera.Pos, 300, false, false ) );
                     if( !d )
-                        d = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Global.pCamera.Pos, 1000, false, false ) ); // dalej szukanie, jesli bliżej nie ma
+                        d = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Camera.Pos, 1000, false, false ) ); // dalej szukanie, jesli bliżej nie ma
 
                     if( d && pDynamicNearest ) {
                         // jeśli jakiś jest znaleziony wcześniej
@@ -815,106 +805,32 @@ driver_mode::OnKeyDown(int cKey) {
         }
         case GLFW_KEY_F5: {
             // przesiadka do innego pojazdu
-            if (!FreeFlyModeFlag)
-				// only available in free fly mode
-				break;
+            if( !FreeFlyModeFlag ) { break; }
 
-			TDynamicObject *dynamic = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Global.pCamera.Pos, 50, false, false ) );
-			if (dynamic) {
-				m_relay.post(user_command::entervehicle, 0.0, 0.0, GLFW_PRESS, 0);
+            auto const *targetvehicle { std::get<TDynamicObject *>( simulation::Region->find_vehicle( Camera.Pos, 50, false, false ) ) };
 
-				change_train = dynamic->name();
-			}
-
-            break;
-/*
-            if( false == FreeFlyModeFlag ) {
-                // only available in free fly mode
+            if( targetvehicle == nullptr ) { break; }
+            if( ( targetvehicle->Mechanik ) &&
+                ( false == targetvehicle->Mechanik->AIControllFlag ) ) {
+                // for the time being we don't allow more than one person per vehicle
                 break;
             }
 
-            TDynamicObject *targetvehicle = std::get<TDynamicObject *>( simulation::Region->find_vehicle( Global.pCamera.Pos, 50, false, false ) );
-
-            if( targetvehicle != nullptr ) {
-
-                if( ( true == DebugModeFlag )
-                 || ( targetvehicle->MoverParameters->Vel <= 5.0 ) ) {
-                    // works always in debug mode, or for stopped/slow moving vehicles otherwise
-                    if( simulation::Train == nullptr ) {
-                        simulation::Train = new TTrain(); // jeśli niczym jeszcze nie jeździlismy
-                    }
-                    if( simulation::Train->Dynamic() != nullptr ) {
-                        // jeśli mielismy pojazd
-                        if( simulation::Train->Dynamic()->Mechanik ) { // na skutek jakiegoś błędu może czasem zniknąć
-                            auto const *currentvehicle { simulation::Train->Dynamic() };
-                            auto const samevehicle { currentvehicle == targetvehicle };
-
-                            if( samevehicle ) {
-                                // we already control desired vehicle so don't overcomplicate things
-                                InOutKey(); // do kabiny
-                                break;
-                            }
-
-                            auto const sameconsist {
-                                ( targetvehicle->ctOwner == currentvehicle->Mechanik )
-                             || ( targetvehicle->ctOwner == currentvehicle->ctOwner ) };
-                            auto const isincharge { currentvehicle->Mechanik->primary() };
-                            auto const aidriveractive { currentvehicle->Mechanik->AIControllFlag };
-
-                            if( !sameconsist && isincharge ) {
-                                // oddajemy dotychczasowy AI
-                                simulation::Train->Dynamic()->Mechanik->TakeControl( true );
-                            }
-
-                            if( ( !sameconsist ) // we leave behind an ai driver which should be preserved
-                             || ( aidriveractive ) // we want to preserve existing ai driver
-                             || ( targetvehicle->Mechanik != nullptr ) ) { // .changedynobj swaps drivers but we want a takeover not a swap
-
-                                if( sameconsist && !aidriveractive ) {
-                                    // we will be taking over controller in the target vehicle, so get rid of the old one
-                                    // unless it's an active ai in which case leave it running
-                                    SafeDelete( simulation::Train->Dynamic()->Mechanik );
-                                }
-                                // HACK: by resetting owned vehicle we can reuse dynamic==nullptr code branch below
-                                // TODO: refactor into utility method
-                                simulation::Train->DynamicSet( nullptr );
-                            }
-                            else {
-                                // we can simply move the 'human' controller to the new vehicle
-                                Global.changeDynObj = targetvehicle;
-                                // TODO: choose active cab based on camera's location relative to vehicle's location
-//                                Global.changeDynObj->MoverParameters->CabOccupied = (
-//                                    Train->DynamicObject->MoverParameters->Neighbours[ exitdirection ].vehicle_end ?
-//                                    -1 :
-//                                     1 );
-                            }
-                        }
-                    }
-                    if( simulation::Train->Dynamic() == nullptr ) {
-                        // jeśli niczym jeszcze nie jeździlismy
-                        if( simulation::Train->Init( targetvehicle ) ) {
-                            // przejmujemy sterowanie
-                            if( true == Global.ctrlState ) {
-                                // make sure we can take over the consist
-                                // TODO: remove ctrl key mode once manual cab (de)activation is in place
-                                simulation::Train->Dynamic()->Mechanik->primary( true );
-                            }
-                            simulation::Train->Dynamic()->Mechanik->TakeControl( false, true );
-                            if( true == simulation::Train->Dynamic()->Mechanik->primary() ) {
-                                simulation::Train->Occupied()->CabDeactivisation( true ); // potentially left active
-//                                simulation::Train->Occupied()->CabOccupied = simulation::Train->Occupied()->CabActive;
-                                simulation::Train->Occupied()->CabActivisation();
-                            }
-                            InOutKey(); // do kabiny
-                        }
-                        else {
-                            SafeDelete( simulation::Train ); // i nie ma czym sterować
-                        }
-                    }
-                }
+            if( ( true == DebugModeFlag )
+             || ( targetvehicle->MoverParameters->Vel <= 5.0 ) ) {
+                // works always in debug mode, or for stopped/slow moving vehicles otherwise
+                m_relay.post(
+                    user_command::entervehicle,
+                    ( Global.ctrlState ? GLFW_MOD_CONTROL : 0 ), // TODO: remove ctrl key mode once manual cab (de)activation is in place,
+                    ( simulation::Train ? simulation::Train->id() : 0 ),
+                    GLFW_PRESS,
+                    0,
+                    targetvehicle->GetPosition(),
+                    &targetvehicle->name() );
+				change_train = targetvehicle->name();
             }
             break;
-*/
+
         }
         case GLFW_KEY_F6: {
             // przyspieszenie symulacji do testowania scenerii... uwaga na FPS!
@@ -1176,67 +1092,6 @@ driver_mode::CabView() {
     train->pMechOffset = Camera.m_owneroffset;
 }
 
-void
-driver_mode::ChangeDynamic() {
-
-    auto *train { simulation::Train };
-    if( train == nullptr ) { return; }
-
-    auto *vehicle { train->Dynamic() };
-    auto *occupied { train->Occupied() };
-    auto *driver { vehicle->Mechanik };
-    // Ra: to nie może być tak robione, to zbytnia proteza jest
-    if( driver ) {
-        // AI może sobie samo pójść
-        if( false == driver->AIControllFlag ) {
-            // tylko jeśli ręcznie prowadzony
-            // jeśli prowadzi AI, to mu nie robimy dywersji!
-            occupied->CabDeactivisation();
-            occupied->CabOccupied = 0;
-            occupied->BrakeLevelSet( occupied->Handle->GetPos( bh_NP ) ); //rozwala sterowanie hamulcem GF 04-2016
-            occupied->MainCtrlPos = occupied->MainCtrlNoPowerPos();
-            occupied->ScndCtrlPos = 0;
-            vehicle->MechInside = false;
-            vehicle->Controller = AIdriver;
-        }
-    }
-    TDynamicObject *temp = Global.changeDynObj;
-    vehicle->bDisplayCab = false;
-    vehicle->ABuSetModelShake( {} );
-
-    if( driver ) // AI może sobie samo pójść
-        if( false == driver->AIControllFlag ) {
-            // tylko jeśli ręcznie prowadzony
-            // przsunięcie obiektu zarządzającego
-            driver->MoveTo( temp );
-        }
-
-    train->DynamicSet( temp );
-    // update helpers
-    train = simulation::Train;
-    vehicle = train->Dynamic();
-    occupied = train->Occupied();
-    driver = vehicle->Mechanik;
-    Global.local_start_vehicle = vehicle->name();
-    if( driver ) // AI może sobie samo pójść
-        if( false == driver->AIControllFlag ) // tylko jeśli ręcznie prowadzony
-        {
-            occupied->LimPipePress = occupied->PipePress;
-            occupied->CabActivisation( true ); // załączenie rozrządu (wirtualne kabiny)
-            vehicle->MechInside = true;
-            vehicle->Controller = Humandriver;
-        }
-    train->InitializeCab(
-        occupied->CabActive,
-        vehicle->asBaseDir + occupied->TypeName + ".mmd" );
-    if( false == FreeFlyModeFlag ) {
-        vehicle->bDisplayCab = true;
-        vehicle->ABuSetModelShake( {} ); // zerowanie przesunięcia przed powrotem?
-        CabView(); // na pozycję mecha
-    }
-    Global.changeDynObj = nullptr;
-}
-
 void
 driver_mode::InOutKey()
 { // przełączenie widoku z kabiny na zewnętrzny i odwrotnie
diff --git a/drivermode.h b/drivermode.h
index eedd307b..3e3618b0 100644
--- a/drivermode.h
+++ b/drivermode.h
@@ -91,7 +91,6 @@ private:
     void update_camera( const double Deltatime );
     // handles vehicle change flag
     void OnKeyDown( int cKey );
-    void ChangeDynamic();
     void InOutKey();
     void CabView();
     void ExternalView();
diff --git a/driveruilayer.cpp b/driveruilayer.cpp
index edf28499..772b54d5 100644
--- a/driveruilayer.cpp
+++ b/driveruilayer.cpp
@@ -181,8 +181,14 @@ driver_ui::render_() {
             }
             if( ImGui::Button( locale::strings[ locale::string::driver_pause_quit ].c_str(), ImVec2( popupwidth, 0 ) ) ) {
                 ImGui::CloseCurrentPopup();
-                command_relay commandrelay;
-    			commandrelay.post(user_command::quitsimulation, 0.0, 0.0, GLFW_PRESS, 0);
+                // NOTE: server shuts down entire network, client or standalone instance only shuts down self
+                if( Application.is_server() ) {
+                    command_relay commandrelay;
+                    commandrelay.post( user_command::quitsimulation, 0.0, 0.0, GLFW_PRESS, 0 );
+                }
+                else {
+                    Application.queue_quit();
+                }
             }
             ImGui::EndPopup();
         }
diff --git a/driveruipanels.cpp b/driveruipanels.cpp
index 9730670d..40e9cc5f 100644
--- a/driveruipanels.cpp
+++ b/driveruipanels.cpp
@@ -11,6 +11,7 @@ http://mozilla.org/MPL/2.0/.
 #include "driveruipanels.h"
 
 #include "Globals.h"
+#include "application.h"
 #include "translation.h"
 #include "simulation.h"
 #include "simulationtime.h"
@@ -564,34 +565,45 @@ bool
 debug_panel::render_section_scenario() {
 
     if( false == render_section( "Scenario", m_scenariolines ) ) { return false; }
-
+    if( Application.is_client() ) {
+        // NOTE: simulation clients can't adjust scenarion state, this is reserved for the server/standalone instance
+        return true;
+    }
     // fog slider
     {
         auto fogrange = std::log( Global.fFogEnd );
         if( ImGui::SliderFloat(
             ( to_string( std::exp( fogrange ), 0, 5 ) + " m###fogend" ).c_str(), &fogrange, std::log( 10.0f ), std::log( 25000.0f ), "Fog distance" ) ) {
-            Global.fFogEnd = clamp( std::exp( fogrange ), 10.0f, 25000.0f );
+            command_relay relay;
+            relay.post(
+                user_command::setweather,
+                clamp( std::exp( fogrange ), 10.0f, 25000.0f ),
+                Global.Overcast,
+                GLFW_PRESS, 0 );
         }
     }
     // cloud cover slider
     {
         if( ImGui::SliderFloat(
             ( to_string( Global.Overcast, 2, 5 ) + " (" + Global.Weather + ")###overcast" ).c_str(), &Global.Overcast, 0.0f, 2.0f, "Cloud cover" ) ) {
-            Global.Overcast = clamp( Global.Overcast, 0.0f, 2.0f );
-            simulation::Environment.compute_weather();
+            command_relay relay;
+            relay.post(
+                user_command::setweather,
+                Global.fFogEnd,
+                clamp( Global.Overcast, 0.0f, 2.0f ),
+                GLFW_PRESS, 0 );
         }
     }
     // day of year slider
     {
-        if( ImGui::SliderFloat( ( to_string( Global.fMoveLight, 0, 5 ) + " (" + Global.Season + ")###movelight" ).c_str(), &Global.fMoveLight, 0.0f, 364.0f, "Day of year" ) ) {
-            Global.fMoveLight = clamp( Global.fMoveLight, 0.0f, 365.0f );
-            auto const weather{ Global.Weather };
-            simulation::Environment.compute_season( Global.fMoveLight );
-            simulation::Time.init();
-            if( weather != Global.Weather ) {
-                // HACK: force re-calculation of precipitation
-                Global.Overcast = clamp( Global.Overcast - 0.0001f, 0.0f, 2.0f );
-            }
+        if( ImGui::SliderFloat(
+            ( to_string( Global.fMoveLight, 0, 5 ) + " (" + Global.Season + ")###movelight" ).c_str(), &Global.fMoveLight, 0.0f, 364.0f, "Day of year" ) ) {
+            command_relay relay;
+            relay.post(
+                user_command::setdatetime,
+                clamp( Global.fMoveLight, 0.0f, 365.0f ),
+                simulation::Time.data().wHour * 60 + simulation::Time.data().wMinute,
+                GLFW_PRESS, 0 );
         }
     }
     // time of day slider
@@ -605,15 +617,15 @@ debug_panel::render_section_scenario() {
                 + ":"
                 + std::string( to_string( int( 100 + simulation::Time.data().wMinute ) ).substr( 1, 2 ) ) ) };
         if( ImGui::SliderInt( ( timestring + " (" + Global.Period + ")###simulationtime" ).c_str(), &time, 0, 1439, "Time of day" ) ) {
-            time = clamp( time, 0, 1439 );
-            auto const hour{ std::floor( time / 60 ) };
-            auto const minute{ time % 60 };
-            simulation::Time.data().wHour = hour;
-            simulation::Time.data().wMinute = minute;
+            command_relay relay;
+            relay.post(
+                user_command::setdatetime,
+                Global.fMoveLight,
+                clamp( time, 0, 1439 ),
+                GLFW_PRESS, 0 );
         }
     }
 
-
     return true;
 }
 
diff --git a/network/message.cpp b/network/message.cpp
index 03de9fae..8de64797 100644
--- a/network/message.cpp
+++ b/network/message.cpp
@@ -18,12 +18,16 @@ void network::server_hello::serialize(std::ostream &stream) const
 {
 	sn_utils::ls_uint32(stream, seed);
 	sn_utils::ls_int64(stream, timestamp);
+    sn_utils::ls_int64(stream, config);
+    sn_utils::s_str(stream, scenario);
 }
 
 void network::server_hello::deserialize(std::istream &stream)
 {
 	seed = sn_utils::ld_uint32(stream);
 	timestamp = sn_utils::ld_int64(stream);
+    config = sn_utils::ld_int64(stream);
+    scenario = sn_utils::d_str(stream);
 }
 
 void ::network::request_command::serialize(std::ostream &stream) const
@@ -41,7 +45,6 @@ void ::network::request_command::serialize(std::ostream &stream) const
 			sn_utils::ls_float64(stream, data.param2);
 			sn_utils::ls_float64(stream, data.time_delta);
 
-			sn_utils::s_bool(stream, data.freefly);
 			sn_utils::s_vec3(stream, data.location);
 
 			sn_utils::s_str(stream, data.payload);
@@ -67,7 +70,6 @@ void network::request_command::deserialize(std::istream &stream)
 			data.param2 = sn_utils::ld_float64(stream);
 			data.time_delta = sn_utils::ld_float64(stream);
 
-			data.freefly = sn_utils::d_bool(stream);
 			data.location = sn_utils::d_vec3(stream);
 
 			data.payload = sn_utils::d_str(stream);
diff --git a/network/message.h b/network/message.h
index aa81a5ed..4ddc0b40 100644
--- a/network/message.h
+++ b/network/message.h
@@ -40,6 +40,8 @@ struct server_hello : public message
 
 	uint32_t seed;
 	int64_t timestamp;
+    int64_t config;
+    std::string scenario;
 
 	virtual void serialize(std::ostream &stream) const override;
 	virtual void deserialize(std::istream &stream) override;
diff --git a/network/network.cpp b/network/network.cpp
index 28f20de1..1f5a1f87 100644
--- a/network/network.cpp
+++ b/network/network.cpp
@@ -7,6 +7,8 @@
 #include "application.h"
 #include "Globals.h"
 
+std::uint32_t const EU07_NETWORK_VERSION = 2;
+
 namespace network {
 
 backend_list_t& backend_list() {
@@ -40,7 +42,7 @@ void network::connection::connected()
 
 	if (is_client) {
 		client_hello msg;
-		msg.version = 1;
+		msg.version = EU07_NETWORK_VERSION;
 		msg.start_packet = packet_counter;
 		send_message(msg);
 	}
@@ -125,7 +127,7 @@ void network::server::handle_message(std::shared_ptr<connection> conn, const mes
 	if (msg.type == message::CLIENT_HELLO) {
 		auto cmd = dynamic_cast<const client_hello&>(msg);
 
-		if (cmd.version != 1 // wrong version
+		if (cmd.version != EU07_NETWORK_VERSION // wrong version
 		        || !Global.ready_to_load) { // not ready yet
 			conn->disconnect();
 			return;
@@ -134,6 +136,8 @@ void network::server::handle_message(std::shared_ptr<connection> conn, const mes
 		server_hello reply;
 		reply.seed = Global.random_seed;
 		reply.timestamp = Global.starting_timestamp;
+        reply.config = 0; // TODO: pass bitfield with state of relevant setting switches
+        reply.scenario = Global.SceneryFile;
 		conn->state = connection::CATCHING_UP;
 		conn->backbuffer = backbuffer;
 		conn->backbuffer_pos = 0;
@@ -244,6 +248,8 @@ void network::client::handle_message(std::shared_ptr<connection> conn, const mes
 			Global.random_seed = cmd.seed;
 			Global.random_engine.seed(Global.random_seed);
 			Global.starting_timestamp = cmd.timestamp;
+            // TODO: configure simulation settings according to received cmd.config
+            Global.SceneryFile = cmd.scenario;
 			Global.ready_to_load = true;
 		} else if (Global.random_seed != cmd.seed) {
 			ErrorLog("net: seed mismatch", logtype::net);
diff --git a/particles.cpp b/particles.cpp
index 4c05956e..44df63de 100644
--- a/particles.cpp
+++ b/particles.cpp
@@ -58,20 +58,20 @@ smoke_source::particle_emitter::deserialize( cParser &Input ) {
 void
 smoke_source::particle_emitter::initialize( smoke_particle &Particle ) {
 
-    auto const polarangle { glm::radians( Random( inclination[ value_limit::min ], inclination[ value_limit::max ] ) ) }; // theta
-    auto const azimuthalangle { glm::radians( Random( -180, 180 ) ) }; // phi
+    auto const polarangle { glm::radians( LocalRandom( inclination[ value_limit::min ], inclination[ value_limit::max ] ) ) }; // theta
+    auto const azimuthalangle { glm::radians( LocalRandom( -180, 180 ) ) }; // phi
     // convert spherical coordinates to opengl coordinates
     auto const launchvector { glm::vec3(
         std::sin( polarangle ) * std::sin( azimuthalangle ) * -1,
         std::cos( polarangle ),
         std::sin( polarangle ) * std::cos( azimuthalangle ) ) };
-        auto const launchvelocity { static_cast<float>( Random( velocity[ value_limit::min ], velocity[ value_limit::max ] ) ) };
+        auto const launchvelocity { static_cast<float>( LocalRandom( velocity[ value_limit::min ], velocity[ value_limit::max ] ) ) };
     
     Particle.velocity = launchvector * launchvelocity;
 
-    Particle.rotation = glm::radians( Random( 0, 360 ) );
-    Particle.size = Random( size[ value_limit::min ], size[ value_limit::max ] );
-    Particle.opacity = Random( opacity[ value_limit::min ], opacity[ value_limit::max ] ) / Global.SmokeFidelity;
+    Particle.rotation = glm::radians( LocalRandom( 0, 360 ) );
+    Particle.size = LocalRandom( size[ value_limit::min ], size[ value_limit::max ] );
+    Particle.opacity = LocalRandom( opacity[ value_limit::min ], opacity[ value_limit::max ] ) / Global.SmokeFidelity;
     Particle.age = 0;
 }
 
diff --git a/scenarioloadermode.cpp b/scenarioloadermode.cpp
index 95c791b3..8232afda 100644
--- a/scenarioloadermode.cpp
+++ b/scenarioloadermode.cpp
@@ -36,7 +36,6 @@ scenarioloader_mode::init() {
 // mode-specific update of simulation data. returns: false on error, true otherwise
 bool
 scenarioloader_mode::update() {
-
 	if (!Global.ready_to_load)
 		// waiting for network connection
 		return true;
@@ -44,7 +43,8 @@ scenarioloader_mode::update() {
 	if (!state) {
 		WriteLog("using simulation seed: " + std::to_string(Global.random_seed), logtype::generic);
 
-		WriteLog( "\nLoading scenario \"" + Global.SceneryFile + "\"..." );
+        Application.set_title( Global.AppName + " (" + Global.SceneryFile + ")" );
+        WriteLog( "\nLoading scenario \"" + Global.SceneryFile + "\"..." );
 
 		timestart = std::chrono::system_clock::now();
 		state = simulation::State.deserialize_begin(Global.SceneryFile);
@@ -63,7 +63,7 @@ scenarioloader_mode::update() {
 	// TODO: implement and use next mode cue
 
 	Application.pop_mode();
-    Application.push_mode( eu07_application::mode::driver );
+	Application.push_mode( eu07_application::mode::driver );
 
     return true;
 }
@@ -78,7 +78,7 @@ scenarioloader_mode::enter() {
     simulation::is_ready = false;
 
     m_userinterface->set_background( "logo" );
-    Application.set_title( Global.AppName + " (" + Global.SceneryFile + ")" );
+    Application.set_title( Global.AppName );
     m_userinterface->set_progress();
     m_userinterface->set_progress( "Loading scenery / Wczytywanie scenerii" );
     GfxRenderer->Render();
diff --git a/scene.h b/scene.h
index 4ec48c05..c76846a5 100644
--- a/scene.h
+++ b/scene.h
@@ -59,6 +59,7 @@ struct scratch_data {
 
     std::string name;
     bool initialized { false };
+	bool time_initialized { false };
 };
 
 // basic element of rudimentary partitioning scheme for the section. fixed size, no further subdivision
diff --git a/simulation.cpp b/simulation.cpp
index 767ddfc0..8e229506 100644
--- a/simulation.cpp
+++ b/simulation.cpp
@@ -218,28 +218,58 @@ void state_manager::process_commands() {
 
 		if (commanddata.command == user_command::entervehicle) {
 			// przesiadka do innego pojazdu
-			if (!commanddata.freefly)
-				// only available in free fly mode
+            // NOTE: because malformed scenario can have vehicle name duplicates we first try to locate vehicle in world, with name search as fallback
+            TDynamicObject *targetvehicle = std::get<TDynamicObject *>( simulation::Region->find_vehicle( commanddata.location, 50, false, false ) );
+            if( ( targetvehicle == nullptr ) || ( targetvehicle->name() != commanddata.payload ) ) {
+                targetvehicle = simulation::Vehicles.find( commanddata.payload );
+            }
+
+			if (!targetvehicle)
 				continue;
 
-			TDynamicObject *dynamic = std::get<TDynamicObject *>( simulation::Region->find_vehicle( commanddata.location, 50, false, false ) );
+            auto *senderlocaltrain { simulation::Trains.find_id( static_cast<std::uint16_t>( commanddata.param2 ) ) };
+            if( senderlocaltrain  ) {
+                auto *currentvehicle { senderlocaltrain->Dynamic() };
+                auto const samevehicle { currentvehicle == targetvehicle };
 
-			if (!dynamic)
-				continue;
+                if( samevehicle ) {
+                    // we already control desired vehicle so don't overcomplicate things
+                    continue;
+                }
 
-			TTrain *train = simulation::Trains.find(dynamic->name());
-			if (train)
-				continue;
+                auto const sameconsist{
+                    ( targetvehicle->ctOwner == currentvehicle->Mechanik )
+                 || ( targetvehicle->ctOwner == currentvehicle->ctOwner ) };
+                auto const isincharge{ currentvehicle->Mechanik->primary() };
+                auto const aidriveractive{ currentvehicle->Mechanik->AIControllFlag };
+                // TODO: support for primary mode request passed as commanddata.param1
+                if( !sameconsist && isincharge ) {
+                    // oddajemy dotychczasowy AI
+                    currentvehicle->Mechanik->TakeControl( true );
+                }
+
+                if( sameconsist && !aidriveractive ) {
+                    // since we're consist owner we can simply move to the destination vehicle
+                    senderlocaltrain->MoveToVehicle( targetvehicle );
+                    senderlocaltrain->Dynamic()->Mechanik->TakeControl( false, true );
+                }
+            }
+
+            auto *train { simulation::Trains.find( targetvehicle->name() ) };
+
+            if (train)
+                continue;
 
 			train = new TTrain();
-			if (train->Init(dynamic)) {
+			if (train->Init(targetvehicle)) {
 				simulation::Trains.insert(train);
 			}
 			else {
 				delete train;
 				train = nullptr;
 			}
-		}
+
+        }
 
 		if (commanddata.command == user_command::queueevent) {
 			std::istringstream ss(commanddata.payload);
@@ -268,11 +298,16 @@ void state_manager::process_commands() {
 
 		if (commanddata.command == user_command::setdatetime) {
 			int yearday = std::round(commanddata.param1);
-			int minute = std::round(commanddata.param2 * 60.0);
+			int minute = std::round(commanddata.param2);
 			simulation::Time.set_time(yearday, minute);
 
-			simulation::Environment.compute_season(yearday);
-		}
+            auto const weather { Global.Weather };
+            simulation::Environment.compute_season(yearday);
+            if( weather != Global.Weather ) {
+                // HACK: force re-calculation of precipitation
+                Global.Overcast = clamp( Global.Overcast - 0.0001f, 0.0f, 2.0f );
+            }
+        }
 
 		if (commanddata.command == user_command::setweather) {
 			Global.fFogEnd = commanddata.param1;
@@ -394,6 +429,7 @@ void state_manager::process_commands() {
 		}
 
 		if (commanddata.command == user_command::quitsimulation) {
+            // TBD: allow clients to go into offline mode?
 			Application.queue_quit();
 		}
 
diff --git a/simulationstateserializer.cpp b/simulationstateserializer.cpp
index 090a5c70..af6029ad 100644
--- a/simulationstateserializer.cpp
+++ b/simulationstateserializer.cpp
@@ -320,6 +320,9 @@ state_serializer::deserialize_firstinit( cParser &Input, scene::scratch_data &Sc
     simulation::Events.InitLaunchers();
     simulation::Memory.InitCells();
 
+	if (!Scratchpad.time_initialized)
+		init_time();
+
     Scratchpad.initialized = true;
 }
 
@@ -628,20 +631,14 @@ state_serializer::deserialize_time( cParser &Input, scene::scratch_data &Scratch
         >> time.wHour
         >> time.wMinute;
 
-    if( true == Global.ScenarioTimeCurrent ) {
-        // calculate time shift required to match scenario time with local clock
-        auto timenow = std::time( 0 );
-        auto const *localtime = std::localtime( &timenow );
-        Global.ScenarioTimeOffset = ( ( localtime->tm_hour * 60 + localtime->tm_min ) - ( time.wHour * 60 + time.wMinute ) ) / 60.f;
-    }
-    else if( false == std::isnan( Global.ScenarioTimeOverride ) ) {
-        // scenario time override takes precedence over scenario time offset
-        Global.ScenarioTimeOffset = ( ( Global.ScenarioTimeOverride * 60 ) - ( time.wHour * 60 + time.wMinute ) ) / 60.f;
-    }
-
     // remaining sunrise and sunset parameters are no longer used, as they're now calculated dynamically
     // anything else left in the section has no defined meaning
     skip_until( Input, "endtime" );
+
+	if (!Scratchpad.time_initialized)
+		Scratchpad.time_initialized = true;
+
+	init_time();
 }
 
 void
@@ -974,6 +971,19 @@ state_serializer::deserialize_sound( cParser &Input, scene::scratch_data &Scratc
     return sound;
 }
 
+void state_serializer::init_time() {
+	auto &time = simulation::Time.data();
+	if( true == Global.ScenarioTimeCurrent ) {
+		// calculate time shift required to match scenario time with local clock
+		auto const *localtime = std::gmtime( &Global.starting_timestamp );
+		Global.ScenarioTimeOffset = ( ( localtime->tm_hour * 60 + localtime->tm_min ) - ( time.wHour * 60 + time.wMinute ) ) / 60.f;
+	}
+	else if( false == std::isnan( Global.ScenarioTimeOverride ) ) {
+		// scenario time override takes precedence over scenario time offset
+		Global.ScenarioTimeOffset = ( ( Global.ScenarioTimeOverride * 60 ) - ( time.wHour * 60 + time.wMinute ) ) / 60.f;
+	}
+}
+
 // skips content of stream until specified token
 void
 state_serializer::skip_until( cParser &Input, std::string const &Token ) {
diff --git a/simulationstateserializer.h b/simulationstateserializer.h
index fee8c0f8..2994d7a9 100644
--- a/simulationstateserializer.h
+++ b/simulationstateserializer.h
@@ -76,6 +76,7 @@ private:
     TAnimModel * deserialize_model( cParser &Input, scene::scratch_data &Scratchpad, scene::node_data const &Nodedata );
     TDynamicObject * deserialize_dynamic( cParser &Input, scene::scratch_data &Scratchpad, scene::node_data const &Nodedata );
     sound_source * deserialize_sound( cParser &Input, scene::scratch_data &Scratchpad, scene::node_data const &Nodedata );
+    void init_time();
     // skips content of stream until specified token
     void skip_until( cParser &Input, std::string const &Token );
     // transforms provided location by specifed rotation and offset
diff --git a/utilities.cpp b/utilities.cpp
index d93cfd7a..3e62257c 100644
--- a/utilities.cpp
+++ b/utilities.cpp
@@ -27,8 +27,10 @@ Copyright (C) 2007-2014 Maciej Cierniak
 #include "Globals.h"
 #include "parser.h"
 
+#include "Logs.h"
+
 bool DebugModeFlag = false;
-bool FreeFlyModeFlag = true;
+bool FreeFlyModeFlag = false;
 bool EditorModeFlag = false;
 bool DebugCameraFlag = false;
 bool DebugTractionFlag = false;
@@ -107,7 +109,12 @@ bool ClearFlag( int &Flag, int const Value ) {
 double Random(double a, double b)
 {
 	uint32_t val = Global.random_engine();
-	return interpolate(a, b, (double)val / Global.random_engine.max());
+#ifdef EU07_DEBUG_NETSYNC
+    auto const value = interpolate( a, b, (double)val / Global.random_engine.max() );
+    WriteLog( "random: [" + to_string(a,0) + "-" + to_string(b,0) + "] = " + std::to_string( value ) );
+    return value;
+#endif
+    return interpolate(a, b, (double)val / Global.random_engine.max());
 }
 
 double LocalRandom(double a, double b)