Automatic merge of T1.5.1-770-g1f196a324 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 #875 at 43bf33e: Bug fix for https://bugs.launchpad.net/or/+bug/2036346 Player train switching doesn't work with 3D cabs
- 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 d7a19ee: Extra line with all the arguments for debugging purposes in logfile
- Pull request #899 at c17fdb3: Duplex steam engines - Booster Engine addition

Author: openrails-bot

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

@@ -133,6 +133,9 @@ public class MSTSSteamLocomotive : MSTSLocomotive
         public bool SteamBoosterRunMode = false;
         public bool SteamBoosterIdleMode = false;
         public bool SteamBoosterLatchedLocked = false;
+        float BoosterGearEngageTimeS;
+        float BoosterIdleTimeS;
+        float BoosterGearEngageTimeStartS;
         public float HuDBoosterSteamConsumptionLbpS;
         public float BoosterSteamConsumptionLbpS;
         float BoosterIdleChokeSizeIn;
@@ -2237,19 +2240,26 @@ public override void Update(float elapsedClockSeconds)
                         SteamBoosterRunMode = false;
                         SteamBoosterIdleMode = true;
                         enginethrottle = 0.0f;
+                        BoosterGearEngageTimeS = 0;
                     }
                     // Run mode
                     else if (SteamBoosterAirOpen && SteamBoosterIdle && SteamBoosterLatchedLocked)
                     {
-                        SteamBoosterIdleMode = false;
-                        SteamBoosterRunMode = true;
-                        enginethrottle = throttle;
+                        if (BoosterGearEngageTimeS > 6)
+                        {
+                            SteamBoosterIdleMode = false;
+                            SteamBoosterRunMode = true;
+                            enginethrottle = throttle;
+                        }
+                        BoosterGearEngageTimeS += elapsedClockSeconds;
                     }
-                    else if (!SteamBoosterAirOpen || !SteamBoosterLatchedLocked)
+                    else if (!SteamBoosterAirOpen || !SteamBoosterLatchedLocked) // Turn Booster off completely
                     {
                         SteamBoosterRunMode = false;
                         SteamBoosterIdleMode = false;
                         enginethrottle = 0;
+                        BoosterGearEngageTimeS = 0;
+                        BoosterIdleTimeS = 0;
                     }
 
                         UpdateCylinders(elapsedClockSeconds, enginethrottle, boostercutoff, absSpeedMpS, i);