Automatic merge of T1.6-108-g8fb3285d6 and 13 pull requests

- Pull request #1156 at f46d5f2: Fix incorrectly disabled options in train operations window
- Pull request #1091 at 492795a: Automatic speed control
- Pull request #1120 at ba3c47f: Automatically Calculate Friction Values if Missing
- Pull request #1121 at 91d2d26: Manually Override Articulation
- Pull request #1124 at e241a0d: Built-in PBL2 brake controller
- Pull request #1157 at 39cd994: Dynamic brake authorization by TCS
- Pull request #1159 at 48c9a63: Skip OR warnings about TSRE-specific token Ruler
- Pull request #1162 at 2516cce: specifies precedence of DDS over ACE
- Pull request #1163 at 2f9e292: Fix: Crash when using Camera 8 and F9.
- Pull request #1164 at 1ad9889: Fix: F9 crashes with a front coupled single steam locomotive by Csantucci.
- Pull request #1082 at 5d1572f: Allow variable water level in glass gauge
- Pull request #1128 at 086d502: Particle Emitter Overhaul
- Pull request #1160 at 9dc6b3b: Route Based TTrack Sounds

Author: openrails-bot

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

@@ -464,7 +464,7 @@ public float TenderFuelMassKG              // Decreased by firing and increased
         float MSTSSteamGaugeGlassHeightM;
         float WaterGlassLengthM;
         float waterGlassFractionLevel;            // Water glass level as a fraction
-      //  bool WaterGlassLevelGradientEnabled = false;
+
         float MEPFactor = 0.7f;             // Factor to determine the MEP
         float GrateAreaDesignFactor = 500.0f;   // Design factor for determining Grate Area
         float EvapAreaDesignFactor = 10.0f;     // Design factor for determining Evaporation Area
@@ -1572,11 +1572,10 @@ public override void Initialize()
             WaterGlassMaxLevel = ((WaterGlassLengthM + BoilerCrownCoverageHeightM + BoilerCrownHeightM) + (BoilerDiameterM / 2.0f)) / BoilerDiameterM;   // max height of water gauge as a fraction of boiler level
             WaterGlassMinLevel = referenceBoilerLevelFraction;   // min height of water gauge as a fraction of boiler level
 
-            BoilerWaterFractionAbs = (WaterMinLevel + WaterMaxLevel) / 2;  // Initialise current boiler water level
+            BoilerWaterFractionAbs = (WaterGlassMinLevel + WaterGlassMaxLevel) / 2;  // Initialise current boiler water level to halfway up glass
 
             float MaxWaterFraction = BoilerWaterFractionAbs; // Initialise the max water fraction when the boiler starts
 
-
             if (BoilerEvapRateLbspFt2 == 0) // If boiler evaporation rate is not in ENG file then set a default value
             {
                 if (SteamLocomotiveFuelType == SteamLocomotiveFuelTypes.Wood)
@@ -7376,7 +7375,6 @@ private void UpdateFiring(float absSpeedMpS)
 
               //  var CurrentWaterGaugeFraction = GradientBoilerLevelFraction;
 
-
                 if (SteamLocomotiveFeedWaterType == SteamLocomotiveFeedWaterSystemTypes.MotionPump && !WaterIsExhausted)
                 {