Use plain triple valve if no distributor defined

Author: cesarBLG

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/Brakes/MSTS/AirTwinPipe.cs

@@ -28,13 +28,20 @@ public AirTwinPipe(TrainCar car)
         }
         public override void UpdateTripleValveState(float targetPressurePSI)
         {
-            if (targetPressurePSI < AutoCylPressurePSI - (TripleValveState != ValveState.Release ? 2.2f : 0f)
-                || targetPressurePSI < 2.2f) // The latter is a UIC regulation (0.15 bar)
-                TripleValveState = ValveState.Release;
-            else if (!BailOffOn && targetPressurePSI > AutoCylPressurePSI + (TripleValveState != ValveState.Apply ? 2.2f : 0f))
-                TripleValveState = ValveState.Apply;
+            if (!(Car as MSTSWagon).DistributorPresent)
+            {
+                base.UpdateTripleValveState(targetPressurePSI);
+            }
             else
-                TripleValveState = ValveState.Lap;
+            {
+                if (targetPressurePSI < AutoCylPressurePSI - (TripleValveState != ValveState.Release ? 2.2f : 0f)
+                    || targetPressurePSI < 2.2f) // The latter is a UIC regulation (0.15 bar)
+                    TripleValveState = ValveState.Release;
+                else if (!BailOffOn && targetPressurePSI > AutoCylPressurePSI + (TripleValveState != ValveState.Apply ? 2.2f : 0f))
+                    TripleValveState = ValveState.Apply;
+                else
+                    TripleValveState = ValveState.Lap;
+            }
         }
     }
 }