Bug fix for https://bugs.launchpad.net/or/+bug/2036346 Player train switching doesn't work with 3D cabs

Author: Csantucci

Source/Orts.Simulation/Simulation/Physics/Train.cs

@@ -4362,7 +4362,7 @@ public void CheckFreight()
                     IsFreight = true;
                 if ((car.WagonType == TrainCar.WagonTypes.Passenger) || (car.IsDriveable && car.HasPassengerCapacity))
                     PassengerCarsNumber++;
-                if (car.IsDriveable && (car as MSTSLocomotive).CabViewList.Count > 0) IsPlayable = true;
+                if (car.IsDriveable && ((car as MSTSLocomotive).CabViewList.Count > 0 || car.HasFront3DCab || car.HasRear3DCab)) IsPlayable = true;
             }
             if (TrainType == TRAINTYPE.AI_INCORPORATED && IncorporatingTrainNo > -1) IsPlayable = true;
         } // CheckFreight

Source/RunActivity/Viewer3D/Viewer.cs

@@ -1676,11 +1676,13 @@ public void ChangeCab()
         void PlayerLocomotiveChanged(object sender, EventArgs e)
         {
             PlayerLocomotiveViewer = World.Trains.GetViewer(Simulator.PlayerLocomotive);
-            CabCamera.Activate(); // If you need anything else here the cameras should check for it.
-            SetCommandReceivers();
             ThreeDimCabCamera.ChangeCab(Simulator.PlayerLocomotive);
             HeadOutForwardCamera.ChangeCab(Simulator.PlayerLocomotive);
             HeadOutBackCamera.ChangeCab(Simulator.PlayerLocomotive);
+            if (!Simulator.PlayerLocomotive.HasFront3DCab && !Simulator.PlayerLocomotive.HasRear3DCab)
+                CabCamera.Activate(); // If you need anything else here the cameras should check for it.
+            else ThreeDimCabCamera.Activate();
+            SetCommandReceivers();
         }
 
         // change reference to player train when switching train in Timetable mode