Correct track joint initialisation

Author: peternewell

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

@@ -163,6 +163,8 @@ public TrainCar LastCar
         public bool HuDIsWheelSlip;
         public bool IsBrakeSkid;
 
+        public bool SoundSetupInitialise = true;
+
         public bool HotBoxSetOnTrain = false;
         public int ActivityDurationS
         {
@@ -2004,6 +2006,27 @@ public virtual void Update(float elapsedClockSeconds, bool auxiliaryUpdate = tru
                 LogTrainSpeed(Simulator.ClockTime);
             }
 
+            // Initialise track joint trigger points. Only runs once at start up.
+            if (SoundSetupInitialise)
+            {
+                var trackjointdistanceM = (float)Simulator.TRK.Tr_RouteFile.DistanceBetweenTrackJointsM;
+                float trainLengthM = 0;
+
+                foreach (var car in Cars)
+                {
+                    car.realTimeTrackJointDistanceM = trackjointdistanceM + trainLengthM;
+                    trainLengthM += car.CarLengthM;
+
+                    if (trainLengthM > (float)Simulator.TRK.Tr_RouteFile.DistanceBetweenTrackJointsM)
+                    {
+                        trainLengthM = 0;
+                    }
+
+                }
+
+                SoundSetupInitialise = false;
+            }
+
         } // end Update
 
         //================================================================================================//

Source/Orts.Simulation/Simulation/RollingStocks/TrainCar.cs

@@ -865,7 +865,6 @@ public virtual void Initialize()
                 Trace.TraceInformation("Tunnel 1 tr perimeter {0} Tunnel 1 tr area {1}", SingleTunnelPerimeterAreaM, SingleTunnelPerimeterAreaM);
                 Trace.TraceInformation("Tunnel 2 tr perimeter {0} Tunnel 2 tr area {1}", DoubleTunnelPerimeterM, DoubleTunnelCrossSectAreaM2);
 #endif
-            realTimeTrackJointDistanceM = (float)Simulator.TRK.Tr_RouteFile.DistanceBetweenTrackJointsM; // Initialise track joint distance
             SoundAxleCount = (LocoNumDrvAxles + WagonNumAxles);
 
         }