diff --git a/Driver.cpp b/Driver.cpp
index e3201111..2f81de54 100644
--- a/Driver.cpp
+++ b/Driver.cpp
@@ -456,7 +456,7 @@ bool TController::TableAddNew()
     return true; // false gdy się nałoży
 };
 
-bool TController::TableNotFound(basic_event const *Event) const
+bool TController::TableNotFound(basic_event const *Event, double const Distance ) const
 { // sprawdzenie, czy nie został już dodany do tabelki (np. podwójne W4 robi problemy)
     auto lookup =
         std::find_if(
@@ -471,7 +471,11 @@ bool TController::TableNotFound(basic_event const *Event) const
         WriteLog( "Speed table for " + OwnerName() + " already contains event " + lookup->evEvent->m_name );
     }
 
-    return lookup == sSpeedTable.end();
+    // ignore duplicates which seem to be reasonably apart from each other, on account of looping tracks
+    // NOTE: since supplied distance is only rough approximation of distance to the event, we're using large safety margin
+    return (
+        ( lookup == sSpeedTable.end() )
+     || ( Distance - lookup->fDist > 100.0 ) );
 };
 
 void TController::TableTraceRoute(double fDistance, TDynamicObject *pVehicle)
@@ -575,7 +579,7 @@ void TController::TableTraceRoute(double fDistance, TDynamicObject *pVehicle)
             for( auto *pEvent : events ) {
                 if( pEvent != nullptr ) // jeśli jest semafor na tym torze
                 { // trzeba sprawdzić tabelkę, bo dodawanie drugi raz tego samego przystanku nie jest korzystne
-                    if (TableNotFound(pEvent)) // jeśli nie ma
+                    if (TableNotFound(pEvent, fCurrentDistance)) // jeśli nie ma
                     {
                         TableAddNew(); // zawsze jest true
 
@@ -2368,6 +2372,10 @@ double TController::BrakeAccFactor() const
        || ( mvOccupied->Vel > VelDesired + fVelPlus ) ) ) {
         Factor += ( fBrakeReaction * ( /*mvOccupied->BrakeCtrlPosR*/BrakeCtrlPosition < 0.5 ? 1.5 : 1 ) ) * mvOccupied->Vel / ( std::max( 0.0, ActualProximityDist ) + 1 ) * ( ( AccDesired - AbsAccS_pub ) / fAccThreshold );
     }
+/*
+	if (mvOccupied->TrainType == dt_DMU && mvOccupied->Vel > 40 && VelNext<40)
+		Factor *= 1 + ( (1600 - VelNext * VelNext) / (mvOccupied->Vel * mvOccupied->Vel) );
+*/
 	return Factor;
 }
 
@@ -2984,6 +2992,7 @@ bool TController::IncSpeed()
                     // if it generates enough traction force
                     // to build up speed to 30/40 km/h for passenger/cargo train (10 km/h less if going uphill)
                     auto const sufficienttractionforce { std::abs( mvControlling->Ft ) > ( IsHeavyCargoTrain ? 125 : 100 ) * 1000.0 };
+                    auto const sufficientacceleration { AbsAccS_pub >= ( IsHeavyCargoTrain ? 0.02 : 0.04 ) };
                     auto const seriesmodefieldshunting { ( mvControlling->ScndCtrlPos > 0 ) && ( mvControlling->RList[ mvControlling->MainCtrlPos ].Bn == 1 ) };
                     auto const parallelmodefieldshunting { ( mvControlling->ScndCtrlPos > 0 ) && ( mvControlling->RList[ mvControlling->MainCtrlPos ].Bn > 1 ) };
                     auto const useseriesmodevoltage {
@@ -2995,6 +3004,7 @@ bool TController::IncSpeed()
                         ( mvControlling->Imax > mvControlling->ImaxLo )
                      || ( fVoltage < useseriesmodevoltage )
                      || ( ( true == sufficienttractionforce )
+                       && ( true == sufficientacceleration ) 
                        && ( mvOccupied->Vel <= ( IsCargoTrain ? 35 : 25 ) + ( seriesmodefieldshunting ? 5 : 0 ) - ( ( fAccGravity < -0.025 ) ? 10 : 0 ) ) ) );
                     // when not in series mode use the first available parallel mode configuration until 50/60 km/h for passenger/cargo train
                     // (if there's only one parallel mode configuration it'll be used regardless of current speed)
@@ -3004,6 +3014,7 @@ bool TController::IncSpeed()
                      && ( useseriesmode ?
                             mvControlling->RList[ mvControlling->MainCtrlPos ].Bn == 1 :
                             ( ( true == sufficienttractionforce )
+                           && ( true == sufficientacceleration )
                            && ( mvOccupied->Vel <= ( IsCargoTrain ? 55 : 45 ) + ( parallelmodefieldshunting ? 5 : 0 ) ) ?
                                 mvControlling->RList[ mvControlling->MainCtrlPos ].Bn > 1 :
                                 mvControlling->MainCtrlPos == mvControlling->MainCtrlPosNo ) ) );
diff --git a/Driver.h b/Driver.h
index d75de7d1..4abade2c 100644
--- a/Driver.h
+++ b/Driver.h
@@ -363,7 +363,7 @@ private:
     // Ra: metody obsługujące skanowanie toru
     std::vector<basic_event *> CheckTrackEvent( TTrack *Track, double const fDirection ) const;
     bool TableAddNew();
-    bool TableNotFound( basic_event const *Event ) const;
+    bool TableNotFound( basic_event const *Event, double const Distance ) const;
     void TableTraceRoute( double fDistance, TDynamicObject *pVehicle );
     void TableCheck( double fDistance );
     TCommandType TableUpdate( double &fVelDes, double &fDist, double &fNext, double &fAcc );
diff --git a/Globals.cpp b/Globals.cpp
index 41ebbc35..562b6b2c 100644
--- a/Globals.cpp
+++ b/Globals.cpp
@@ -127,7 +127,13 @@ global_settings::ConfigParse(cParser &Parser) {
             // selected device for audio renderer
             Parser.getTokens();
             Parser >> AudioVolume;
-            AudioVolume = clamp( AudioVolume, 0.0f, 2.f );
+            AudioVolume = clamp( AudioVolume, 0.f, 2.f );
+        }
+        else if( token == "sound.volume.radio" ) {
+            // selected device for audio renderer
+            Parser.getTokens();
+            Parser >> RadioVolume;
+            RadioVolume = clamp( RadioVolume, 0.f, 1.f );
         }
         // else if (str==AnsiString("renderalpha")) //McZapkie-1312302 - dwuprzebiegowe renderowanie
         // bRenderAlpha=(GetNextSymbol().LowerCase()==AnsiString("yes"));
diff --git a/Globals.h b/Globals.h
index 2b1f9dd8..9348b9d1 100644
--- a/Globals.h
+++ b/Globals.h
@@ -133,7 +133,8 @@ struct global_settings {
     double fFpsMax{ 65.0 }; // górna granica FPS, przy której promień scenerii będzie zwiększany
     // audio
     bool bSoundEnabled{ true };
-    float AudioVolume{ 1.25f };
+    float AudioVolume{ 1.f };
+    float RadioVolume{ 0.75f };
     std::string AudioRenderer;
     // input
     float fMouseXScale{ 1.5f };
diff --git a/McZapkie/Mover.cpp b/McZapkie/Mover.cpp
index 3aaa4d88..15f84897 100644
--- a/McZapkie/Mover.cpp
+++ b/McZapkie/Mover.cpp
@@ -3891,7 +3891,18 @@ void TMoverParameters::ComputeConstans(void)
     }
     Ff = TotalMassxg * (BearingF + RollF * V * V / 10.0) / 1000.0;
     // dorobic liczenie temperatury lozyska!
-    FrictConst1 = ((TotalMassxg * RollF) / 10000.0) + (Cx * Dim.W * Dim.H);
+    FrictConst1 = ( TotalMassxg * RollF ) / 10000.0;
+    // drag calculation
+    {
+        // NOTE: draft effect of previous vehicle is simplified and doesn't have much to do with reality
+        auto const *previousvehicle { Couplers[ ( V >= 0.0 ? end::front : end::rear ) ].Connected };
+        auto dragarea { Dim.W * Dim.H };
+        if( previousvehicle ) {
+            dragarea = std::max( 0.0, dragarea - ( 0.85 * previousvehicle->Dim.W * previousvehicle->Dim.H ) );
+        }
+        FrictConst1 += Cx * dragarea;
+    }
+
     Curvature = abs(RunningShape.R); // zero oznacza nieskończony promień
     if (Curvature > 0.0)
         Curvature = 1.0 / Curvature;
diff --git a/McZapkie/hamulce.cpp b/McZapkie/hamulce.cpp
index 7efb0994..c6c33e34 100644
--- a/McZapkie/hamulce.cpp
+++ b/McZapkie/hamulce.cpp
@@ -2773,6 +2773,8 @@ double TMHZ_K5P::GetPF(double i_bcp, double PP, double HP, double dt, double ep)
 void TMHZ_K5P::Init(double Press)
 {
 	CP = Press;
+    Time = true;
+    TimeEP = true;
 }
 
 void TMHZ_K5P::SetReductor(double nAdj)
diff --git a/Train.cpp b/Train.cpp
index eb0c4d74..0555adac 100644
--- a/Train.cpp
+++ b/Train.cpp
@@ -6537,7 +6537,7 @@ void TTrain::update_sounds_radio() {
         auto const volume {
             ( true == radioenabled )
          && ( message.first == iRadioChannel ) ?
-                1.0 :
+                Global.RadioVolume :
                 0.0 };
         message.second->gain( volume );
     }
diff --git a/version.h b/version.h
index 8f8c33cb..62cba964 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #pragma once
 
 #define VERSION_MAJOR 19
-#define VERSION_MINOR 411
+#define VERSION_MINOR 419
 #define VERSION_REVISION 0