Automatic merge of T1.5.1-772-g23e1f0db5 and 15 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 d9ce84b: 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 #893 at bf8876b: Signal errors
- Pull request #894 at 5ff1e73: Correct Decrease Colour
- 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 #898 at 2d1b44a: Extra line with all the arguments for debugging purposes in logfile
- Pull request #899 at e5db0a2: Duplex steam engines - Booster Engine addition
- Pull request #903 at a0d2991: first phase downloading from Github
- Pull request #904 at 8dc3628: fix: adds downgrade to low precision

Author: openrails-bot

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

@@ -5430,8 +5430,9 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
                 else // typically this will be a booster or geared engine
                 {
                     // If the steam piston is exceeding the maximum design piston rate then decrease efficiency of mep
-                    if (SteamEngineType == SteamEngineTypes.Geared && SteamEngines[numberofengine].PistonSpeedFtpMin > MaxSteamGearPistonRateFtpM && SteamEngines[numberofengine].AuxiliarySteamEngineType == SteamEngine.AuxiliarySteamEngineTypes.Booster)
+                    if (SteamEngineType == SteamEngineTypes.Geared && SteamEngines[numberofengine].PistonSpeedFtpMin > MaxSteamGearPistonRateFtpM)
                     {
+
                         // use straight line curve to decay mep to zero by 2 x piston speed
                         float pistonforcedecay = 1.0f - (1.0f / MaxSteamGearPistonRateFtpM) * (SteamEngines[numberofengine].PistonSpeedFtpMin - MaxSteamGearPistonRateFtpM);
                         pistonforcedecay = MathHelper.Clamp(pistonforcedecay, 0.0f, 1.0f);  // Clamp decay within bounds
@@ -5450,7 +5451,7 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
                         GearRatioAdjusted = MotiveForceGearRatio;
                     }
 
-                    SteamEngines[numberofengine].TractiveForceN = N.FromLbf((SteamEngines[numberofengine].NumberCylinders / 2.0f) * (Me.ToIn(SteamEngines[numberofengine].CylindersDiameterM) * Me.ToIn(SteamEngines[numberofengine].CylindersDiameterM) * Me.ToIn(SteamEngines[numberofengine].CylindersStrokeM) / (2.0f * Me.ToIn(DriverWheelRadiusM))) * (SteamEngines[numberofengine].MeanEffectivePressurePSI * CylinderEfficiencyRate) * MotiveForceGearRatio);
+                    SteamEngines[numberofengine].TractiveForceN = N.FromLbf((SteamEngines[numberofengine].NumberCylinders / 2.0f) * (Me.ToIn(SteamEngines[numberofengine].CylindersDiameterM) * Me.ToIn(SteamEngines[numberofengine].CylindersDiameterM) * Me.ToIn(SteamEngines[numberofengine].CylindersStrokeM) / (2.0f * Me.ToIn(DriverWheelRadiusM))) * (SteamEngines[numberofengine].MeanEffectivePressurePSI * CylinderEfficiencyRate) * GearRatioAdjusted);
 
                     // Force tractive effort to zero if throttle is closed, or if a geared steam locomotive in neutral gear. MEP calculation is not allowing it to go to zero
                     if (locomotivethrottle < 0.001 || (SteamEngineType == SteamEngineTypes.Geared && SteamGearPosition == 0))