Automatic merge of T1.5.1-794-g4cad06780 and 14 pull requests

- Pull request #570 at 3539862: Experimental glTF 2.0 support with PBR lighting
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #882 at a055bca: Blueprint/train car operations UI window
- Pull request #885 at 8f94333: feat: Add notifications to Menu
- Pull request #886 at 6c0785b: Scene viewer extension to TrackViewer
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #896 at 5866028: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains
- Pull request #897 at 0a9d939: feat: Improved system information collection
- Pull request #899 at abbd3b1: Duplex steam engines - Booster Engine addition
- Pull request #903 at 7353625: Downloading route content (Github, zip)
- Pull request #906 at 5850660: Bug fix for https://bugs.launchpad.net/or/+bug/2047299 Crash loading a 3Dcab-only loco
- Pull request #907 at 9b0b04f: Bug fix for https://bugs.launchpad.net/or/+bug/2047300 Dynamic tracks disappear after long tunnel
- Pull request #908 at 4b4afe3: feat: supports switching adhesion precisions

Author: openrails-bot

Source/Orts.Simulation/Simulation/RollingStocks/MSTSLocomotive.cs

@@ -147,7 +147,7 @@ public enum SoundState
         public bool OnLineCabRadio;
         public string OnLineCabRadioURL;
 
-        float ZeroSpeedAdhesionBase;
+        public float ZeroSpeedAdhesionBase;
 
         public float FilteredBrakePipeFlowM3pS;
         public IIRFilter AFMFilter;
@@ -2798,15 +2798,6 @@ public virtual void AdvancedAdhesion(float elapsedClockSeconds)
                 WheelSlip = LocomotiveAxles.IsWheelSlip;
                 WheelSlipWarning = LocomotiveAxles.IsWheelSlipWarning;
             }
-            
-            // This enables steam locomotives to have different speeds for driven and non-driven wheels.
-            if (EngineType == EngineTypes.Steam && SteamEngineType != MSTSSteamLocomotive.SteamEngineTypes.Geared)
-            {
-                WheelSpeedSlipMpS = (float)LocomotiveAxles[0].AxleSpeedMpS;
-                WheelSpeedMpS = SpeedMpS;
-            }
-            else WheelSpeedMpS = (float)LocomotiveAxles[0].AxleSpeedMpS;
-
         }
 
         public void SimpleAdhesion()

Source/Orts.Simulation/Simulation/RollingStocks/MSTSSteamLocomotive.cs

@@ -2326,16 +2326,21 @@ public override void Update(float elapsedClockSeconds)
 
 //                        Trace.TraceInformation("Run Mode - Timer {0} GearPeriod {1}", BoosterGearEngageTimeS, BoosterGearEngageTimePeriodS);
 
-                        if (BoosterGearEngageTimeS > BoosterGearEngageTimePeriodS)
+                        if (BoosterGearEngageTimeS > BoosterGearEngageTimePeriodS) // Booster gears engaged
                         {
                             enginethrottle = throttle;
                             BoosterCylinderSteamExhaustOn = true;
-                            BoosterCylinderCocksOn = true;
+                            BoosterCylinderCocksOn = false;
                             BoosterGearsEngaged = true;
                             BoosterIdleHeatingTimerReset = false;
                             BoosterIdleHeatingTimerS = 0;
                           //  Trace.TraceInformation("Run Mode - " );
                         }
+                        else
+                        {
+                            BoosterCylinderSteamExhaustOn = false;
+                            BoosterCylinderCocksOn = true;
+                        }
                         BoosterGearEngageTimeS += elapsedClockSeconds;                        
                     }
                     else if (!SteamBoosterAirOpen || !SteamBoosterLatchedLocked) // Turn Booster off completely
@@ -5797,6 +5802,7 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
                 SteamEngines[numberofengine].TractiveForceN = N.FromLbf((SteamEngines[numberofengine].MaxIndicatedHorsePowerHP * 375.0f) / pS.TopH(Me.ToMi(SpeedMpS)));
                 SteamEngines[numberofengine].IndicatedHorsePowerHP = SteamEngines[numberofengine].MaxIndicatedHorsePowerHP; // Set IHP to maximum value
                 IsCritTELimit = true; // Flag if limiting TE
+
             }
             else
             {
@@ -5810,7 +5816,11 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
         protected override void UpdateTractiveForce(float elapsedClockSeconds, float locomotivethrottle, float AbsSpeedMpS, float AbsWheelSpeedMpS)
         {
             TractiveForceN = 0; // reset tractiveforceN in preparation to calculating a new value
-            MotiveForceN = 0;
+            if (!Simulator.UseAdvancedAdhesion && Simulator.Settings.SimpleControlPhysics)
+            {
+                // Simple adhesion
+                MotiveForceN = 0;
+            }
             IndicatedHorsePowerHP = 0;
             PistonSpeedFtpMin = 0;
             MaxPowerW = 0;
@@ -5825,9 +5835,9 @@ protected override void UpdateTractiveForce(float elapsedClockSeconds, float loc
 
                 if (Simulator.UseAdvancedAdhesion && !Simulator.Settings.SimpleControlPhysics)
                 {
-                    SteamEngines[i].AttachedAxle.DriveForceN = SteamEngines[i].TractiveForceN / SteamEngines[i].AttachedAxle.NumberWheelAxles;
+                    SteamEngines[i].AttachedAxle.DriveForceN = SteamEngines[i].TractiveForceN;
                     UpdateAxleDriveForce();
-                    MotiveForceN += SteamEngines[i].AttachedAxle.CompensatedAxleForceN;
+           //         MotiveForceN += SteamEngines[i].AttachedAxle.CompensatedAxleForceN;
                 }
                 else // Simple adhesion
                 {
@@ -5903,7 +5913,7 @@ protected override void UpdateAxleDriveForce()
 
 
         public override void AdvancedAdhesion(float elapsedClockSeconds)
-        {
+        { 
 
             foreach (var axle in LocomotiveAxles)
             {
@@ -5969,9 +5979,41 @@ public override void AdvancedAdhesion(float elapsedClockSeconds)
                     axle.FrictionN = N.FromLbf(3.8f * Me.ToIn(linkedEngine.CylindersDiameterM) * Me.ToIn(linkedEngine.CylindersDiameterM) * Me.ToIn(linkedEngine.CylindersStrokeM) / (Me.ToIn(axle.WheelRadiusM * 2.0f)));
 
                 }
+
+                axle.BrakeRetardForceN = BrakeRetardForceN / LocomotiveAxles.Count;
+                axle.TrainSpeedMpS = SpeedMpS;                //Set the train speed of the axle mod
+                axle.WheelRadiusM = linkedEngine.AttachedAxle.WheelRadiusM;
+                axle.WheelDistanceGaugeM = TrackGaugeM;
+                axle.CurrentCurveRadiusM = CurrentCurveRadiusM;
+                axle.BogieRigidWheelBaseM = RigidWheelBaseM;
+                axle.CurtiusKnifflerZeroSpeed = ZeroSpeedAdhesionBase;
+                
+            }
+            
+            LocomotiveAxles.Update(elapsedClockSeconds);
+
+            MotiveForceN = LocomotiveAxles.CompensatedForceN;
+
+            if (LocoNumDrvAxles <= 0)
+            {
+                WheelSpeedMpS = AbsSpeedMpS;
+                return;
+            }
+
+            if (elapsedClockSeconds > 0)
+            {
+                WheelSlip = LocomotiveAxles.IsWheelSlip;
+                WheelSlipWarning = LocomotiveAxles.IsWheelSlipWarning;
+            }
+
+            // This enables steam locomotives to have different speeds for driven and non-driven wheels.
+            if (SteamEngineType != MSTSSteamLocomotive.SteamEngineTypes.Geared)
+            {
+                WheelSpeedSlipMpS = (float)LocomotiveAxles[0].AxleSpeedMpS;
+                WheelSpeedMpS = SpeedMpS;
             }
+            else WheelSpeedMpS = (float)LocomotiveAxles[0].AxleSpeedMpS;
 
-            base.AdvancedAdhesion(elapsedClockSeconds);
         }
 
         private void UpdateAuxiliaries(float elapsedClockSeconds, float absSpeedMpS)