Automatic merge of T1.6-186-g21d9ada29 and 9 pull requests

- Pull request #1082 at 1e9d30b: Allow variable water level in glass gauge
- Pull request #1057 at 85bde8e: Switchable brake system
- Pull request #1122 at 73c47b4: Wagon Size and Centering Controls
- Pull request #1124 at e241a0d: Built-in PBL2 brake controller
- Pull request #1128 at b6c197f: Particle Emitter Overhaul
- Pull request #1169 at 906f204: Revise TrainCar.SetUpWheels to Better Handle Unusual Rolling Stock
- Pull request #1175 at d28315e: Make Data Logger interval configurable
- Pull request #1176 at 4cd961b: Remove Implicit Requirement for Engine Name to Come After "Engine ("
- Pull request #1178 at 015769e: Fix Diesel RPM Rate of Change

Author: openrails-bot

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

@@ -7537,7 +7537,7 @@ private void UpdateWaterInjection(float elapsedClockSeconds)
                         }
                         else // Exhaust steam injector
                         {
-                            if (throttle > 0.01)
+                            if (throttle > 0.01 && BackPressureIHPtoPSI[IndicatedHorsePowerHP] > 1)
                             {
                                 Injector1CorrectedPressurePSI = BackPressureIHPtoPSI[IndicatedHorsePowerHP];
                                 ActualInjector1FlowRateLBpS = Injector1Fraction * Injector1NozzleCorrectionFactor * pS.FrompH(ExhaustSteamInjectorMaximaWaterDeliveryLBatPSIandF.Get(tenderTemperatureF, Injector1CorrectedPressurePSI));
@@ -7559,7 +7559,7 @@ private void UpdateWaterInjection(float elapsedClockSeconds)
                                 // A small amount of supplemental steam will be added to live steam injectors to maintain pressure, hence a small heat loss
                                 Inject1SteamHeatLossBTUpS = LiveSteamInjector1SupplementSteamUsedLBpS * (BoilerSteamHeatBTUpLB - WaterHeatPSItoBTUpLB[Injector1WaterTempPressurePSI]); // Calculate heat loss for injection steam, ie steam heat to water delivery temperature
                             }
-                            else // Auxiliary live steam supply when no throttle
+                            else // Auxiliary live steam supply when no throttle or back pressure drops too low
                             {
                                 Injector1CorrectedPressurePSI = Injector1AuxiliaryPressureCorrectionFactor * BoilerPressurePSI;
                                 ActualInjector1FlowRateLBpS = Injector1Fraction * Injector1AuxiliaryNozzleCorrectionFactor * pS.FrompH(LiveSteamInjectorMaximaWaterDeliveryLBatPSIandF.Get(tenderTemperatureF, Injector1CorrectedPressurePSI));
@@ -7635,7 +7635,7 @@ private void UpdateWaterInjection(float elapsedClockSeconds)
                         }
                         else // Exhaust steam injector
                         {
-                            if (throttle > 0.01)
+                            if (throttle > 0.01 && BackPressureIHPtoPSI[IndicatedHorsePowerHP] > 1)
                             {
                                 Injector2CorrectedPressurePSI = BackPressureIHPtoPSI[IndicatedHorsePowerHP];
                                 ActualInjector2FlowRateLBpS = Injector2Fraction * Injector2NozzleCorrectionFactor * pS.FrompH(ExhaustSteamInjectorMaximaWaterDeliveryLBatPSIandF.Get(tenderTemperatureF, Injector2CorrectedPressurePSI));
@@ -7657,7 +7657,7 @@ private void UpdateWaterInjection(float elapsedClockSeconds)
                                 // A small amount of supplemental steam will be added to live steam injectors to maintain pressure, hence a small heat loss
                                 Inject2SteamHeatLossBTUpS = LiveSteamInjector2SupplementSteamUsedLBpS * (BoilerSteamHeatBTUpLB - WaterHeatPSItoBTUpLB[Injector1WaterTempPressurePSI]); // Calculate heat loss for injection steam, ie steam heat to water delivery temperature
                             }
-                            else // Auxiliary live steam supply when no throttle
+                            else // Auxiliary live steam supply when no throttle or back pressure drops too low
                             {
                                 Injector2CorrectedPressurePSI = Injector2AuxiliaryPressureCorrectionFactor * BoilerPressurePSI;
                                 ActualInjector2FlowRateLBpS = Injector2Fraction * Injector2AuxiliaryNozzleCorrectionFactor * pS.FrompH(LiveSteamInjectorMaximaWaterDeliveryLBatPSIandF.Get(tenderTemperatureF, Injector2CorrectedPressurePSI));