Merge pull request #530 from peternewell/steam_adhesion

Steam adhesion not applied to all locomotives in the player train.

Author: peternewell

Source/Orts.Simulation/Simulation/RollingStocks/MSTSLocomotive.cs

@@ -2788,6 +2788,7 @@ public virtual void UpdateWaterTroughRefill(float elapsedClockSeconds, float abs
         /// Dry track = 0.33 
         /// 
         /// The following values are indicatitive values only (sourced from Principles and Applications of Tribology).
+        /// https://books.google.com.au/books?id=LtYgBQAAQBAJ&pg=PA312&lpg=PA312&dq=Principles+and+Applications+of+Tribology+table+14.1&source=bl&ots=2hfz1WpEsM&sig=ACfU3U3U9y9Lwov9GORLaKCO10SCFHvjhA&hl=en&sa=X&ved=2ahUKEwi82NCF_Yr0AhWNTX0KHcGfB3QQ6AF6BAgMEAM#v=onepage&q=Principles%20and%20Applications%20of%20Tribology%20table%2014.1&f=false
         /// Wet track (clean) = 0.18 <=> 0.2
         /// Wet track (sand) = 0.22 <=> 0.25
         /// Dew or fog = 0.09 <=> 0.15

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

@@ -4652,8 +4652,8 @@ 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 && this == Simulator.PlayerLocomotive && this.Train.TrainType != Train.TRAINTYPE.AI_PLAYERHOSTING)
-                // only set advanced wheel slip when advanced adhesion, and simplecontrols/physics is not set and is the player locomotive, AI locomotive will not work to this model. 
+            if (Simulator.UseAdvancedAdhesion && !Simulator.Settings.SimpleControlPhysics && IsPlayerTrain && this.Train.TrainType != Train.TRAINTYPE.AI_PLAYERHOSTING)
+                // 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
             {
                 float SlipCutoffPressureAtmPSI;