diff --git a/rendering/opengl33renderer.cpp b/rendering/opengl33renderer.cpp
index 5419bbcd..b9937816 100644
--- a/rendering/opengl33renderer.cpp
+++ b/rendering/opengl33renderer.cpp
@@ -3730,7 +3730,9 @@ void opengl33_renderer::Render(TSubModel *Submodel)
 				case rendermode::shadows:
 				{
                     // skip if the shadow caster rank is too low for currently set threshold
-                    if( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                    // or if the submodel is hidden (colour pass only fades it out, e.g. inactive seasonal variant)
+                    if( ( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                     || ( Submodel->fVisible <= 0.f ) )
                     {
                         --m_renderpass.draw_stats.submodels;
                         --m_renderpass.draw_stats.drawcalls;
@@ -4630,7 +4632,9 @@ void opengl33_renderer::Render_Alpha(TSubModel *Submodel)
 				case rendermode::shadows:
 				{
                     // skip if the shadow caster rank is too low for currently set threshold
-                    if( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                    // or if the submodel is hidden (colour pass only fades it out, e.g. inactive seasonal variant)
+                    if( ( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                     || ( Submodel->fVisible <= 0.f ) )
                     {
                         --m_renderpass.draw_stats.submodels;
                         --m_renderpass.draw_stats.drawcalls;
diff --git a/rendering/openglrenderer.cpp b/rendering/openglrenderer.cpp
index 1da66ba5..6f06e9b3 100644
--- a/rendering/openglrenderer.cpp
+++ b/rendering/openglrenderer.cpp
@@ -2863,7 +2863,9 @@ opengl_renderer::Render( TSubModel *Submodel ) {
                     }
                     case rendermode::shadows: {
                         // skip if the shadow caster rank is too low for currently set threshold
-                        if( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                        // or if the submodel is hidden (colour pass only fades it out, e.g. inactive seasonal variant)
+                        if( ( Material( Submodel ).shadow_rank > Global.gfx_shadow_rank_cutoff )
+                         || ( Submodel->fVisible <= 0.f ) )
                         {
                             --m_renderpass.draw_stats.submodels;
                             --m_renderpass.draw_stats.drawcalls;
diff --git a/vehicle/DynObj.cpp b/vehicle/DynObj.cpp
index 57cc8660..873cc4d3 100644
--- a/vehicle/DynObj.cpp
+++ b/vehicle/DynObj.cpp
@@ -800,6 +800,19 @@ TDynamicObject::set_cab_lights( int const Cab, float const Level ) {
     }
 }
 
+// aktualizujemy submodele w zaleznosci od aktualnej pory roku
+void TDynamicObject::on_season_update()
+{
+    if (sm_winter_variant != nullptr) // pokazujemy wariant zimowy
+        sm_winter_variant->SetVisibilityLevel(Global.Season == "winter:" ? 1 : 0, true, false);
+    if (sm_spring_variant != nullptr) // pokazujemy wariant wiosenny
+        sm_spring_variant->SetVisibilityLevel(Global.Season == "spring:" ? 1 : 0, true, false);
+    if (sm_summer_variant != nullptr) // pokazujemy wariant letni
+        sm_summer_variant->SetVisibilityLevel(Global.Season == "summer:" ? 1 : 0, true, false);
+    if (sm_autumn_variant != nullptr) // pokazujemy wariant jesienny
+        sm_autumn_variant->SetVisibilityLevel(Global.Season == "autumn:" ? 1 : 0, true, false);
+}
+
 // ABu 29.01.05 przeklejone z render i renderalpha: *********************
 void TDynamicObject::ABuLittleUpdate(double ObjSqrDist)
 { // ABu290105: pozbierane i uporzadkowane powtarzajace
@@ -814,6 +827,10 @@ void TDynamicObject::ABuLittleUpdate(double ObjSqrDist)
         if (vFloor.z > 0.0)
             mdLoad->GetSMRoot()->SetTranslate(modelShake + vFloor);
 
+    // model jest współdzielony przez pojazdy, a pora roku może się zmienić w trakcie symulacji
+    if (Global.UpdateMaterials)
+        on_season_update();
+
     if (ObjSqrDist < 400 * 400 ) // gdy bliżej niż 400m
     {
         for( auto &animation : pAnimations ) {
@@ -2493,6 +2510,10 @@ TDynamicObject::Init(std::string Name, // nazwa pojazdu, np. "EU07-424"
             smBogie[0]->WillBeAnimated();
         if (smBogie[1])
             smBogie[1]->WillBeAnimated();
+        sm_winter_variant = mdModel->GetFromName("winter_variant");
+        sm_spring_variant = mdModel->GetFromName("spring_variant");
+        sm_summer_variant = mdModel->GetFromName("summer_variant");
+        sm_autumn_variant = mdModel->GetFromName("autumn_variant");
     }
     // ABu: zainicjowanie zmiennej, zeby nic sie nie ruszylo w pierwszej klatce,
     // potem juz liczona prawidlowa wartosc masy
diff --git a/vehicle/DynObj.h b/vehicle/DynObj.h
index c48e40e1..36335a32 100644
--- a/vehicle/DynObj.h
+++ b/vehicle/DynObj.h
@@ -310,6 +310,10 @@ private:
     TSubModel *smWahacze[4]; // wahacze (np. nogi, dźwignia w drezynie)
     TSubModel *smBrakeMode; // Ra 15-01: nastawa hamulca też
     TSubModel *smLoadMode; // Ra 15-01: nastawa próżny/ładowny
+    TSubModel *sm_winter_variant {}; // submodel zimowego wariantu
+    TSubModel *sm_spring_variant {}; // submodel wiosennego wariantu
+    TSubModel *sm_summer_variant {}; // submodel letniego wariantu
+    TSubModel *sm_autumn_variant {}; // submodel jesiennego wariantu
     double fWahaczeAmp;
     // Winger 160204 - pantografy
     double pantspeedfactor;
@@ -462,6 +466,7 @@ private:
     void ABuLittleUpdate(double ObjSqrDist);
     void ABuBogies();
     void ABuModelRoll();
+    void on_season_update();
     void TurnOff();
     // update state of load exchange operation
     void update_exchange( double const Deltatime );