Force RPM at simulation start to circunvent gearbox bug

https://www.elvastower.com/forums/index.php?/topic/36560-msts-diesel-mechanical-bug/

Author: cesarBLG

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/PowerSupplies/DieselEngine.cs

@@ -997,6 +997,11 @@ public void Copy(DieselEngine other)
 
         public void Initialize()
         {
+            if (!Simulator.Settings.NoDieselEngineStart)
+            {
+                RealRPM = IdleRPM;
+                State = DieselEngineState.Running;
+            }
             RPMRange = MaxRPM - IdleRPM;
             MagnitudeRange = MaxMagnitude - InitialMagnitude;
             ExhaustRange = MaxExhaust - InitialExhaust;