Fix issue with geared stam locomotive not operating correctly

Author: peternewell

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

@@ -5008,7 +5008,7 @@ protected override void UpdateTractiveForce(float elapsedClockSeconds, float t,
             // Typically tangential force will be greater at starting then when the locomotive is at speed, as interia and reduce steam pressure will decrease the value. 
             // By default this model uses information based upon a "NYC 4-4-2 locomotive", for smaller locomotives this data is changed in the OR initialisation phase.
 
-            if (Simulator.UseAdvancedAdhesion && !Simulator.Settings.SimpleControlPhysics && IsPlayerTrain && this.Train.TrainType != Train.TRAINTYPE.AI_PLAYERHOSTING)
+            if (Simulator.UseAdvancedAdhesion && !Simulator.Settings.SimpleControlPhysics && IsPlayerTrain && this.Train.TrainType != Train.TRAINTYPE.AI_PLAYERHOSTING && SteamEngineType != SteamEngineTypes.Geared)
             // only set advanced wheel slip when advanced adhesion, and simplecontrols/physics is not set and is in the the player train, AI locomotive will not work to this model. 
             // Don't use slip model when train is in auto pilot
             {

Source/Orts.Simulation/Simulation/RollingStocks/TrainCar.cs

@@ -630,7 +630,7 @@ public Direction Direction
         protected float RouteSpeedMpS; // Max Route Speed Limit
         protected const float GravitationalAccelerationMpS2 = 9.80665f; // Acceleration due to gravity 9.80665 m/s2
         protected int WagonNumAxles; // Number of axles on a wagon
-        protected float MSTSWagonNumWheels; // Number of axless on a wagon - used to read MSTS value as default
+        protected float MSTSWagonNumWheels; // Number of axles on a wagon - used to read MSTS value as default
         protected int LocoNumDrvAxles; // Number of drive axles on locomotive
         protected float MSTSLocoNumDrvWheels; // Number of drive axles on locomotive - used to read MSTS value as default
         public float DriverWheelRadiusM = Me.FromIn(30.0f); // Drive wheel radius of locomotive wheels - Wheel radius of loco drive wheels can be anywhere from about 10" to 40".