Correct an issue with independent brake not working

Author: peternewell

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

@@ -827,9 +827,7 @@ protected static void PropagateBrakeLinePressures(float elapsedClockSeconds, Tra
             int last = -1;
             train.FindLeadLocomotives(ref first, ref last);
             float sumpv = 0;
-            float summainrespv = 0;
             float sumv = 0;
-            float summainresv = 0;
             int continuousFromInclusive = 0;
             int continuousToExclusive = train.Cars.Count;
             for (int i = 0; i < train.Cars.Count; i++)
@@ -857,21 +855,11 @@ protected static void PropagateBrakeLinePressures(float elapsedClockSeconds, Tra
                     sumv += brakeSystem.BrakePipeVolumeM3;
                     sumpv += brakeSystem.BrakePipeVolumeM3 * brakeSystem.BrakeLine2PressurePSI;
 
-                    summainresv += brakeSystem.BrakePipeVolumeM3;
-
-                    if (lead != null)
-                    {
-                        summainrespv += brakeSystem.BrakePipeVolumeM3 * lead.MainResPressurePSI;
-                    }
-
                     var eng = train.Cars[i] as MSTSLocomotive;
                     if (eng != null)
                     {
                         sumv += eng.MainResVolumeM3;
                         sumpv += eng.MainResVolumeM3 * eng.MainResPressurePSI;
-
-                        summainresv += eng.MainResVolumeM3;
-                        summainrespv += eng.MainResVolumeM3 * eng.MainResPressurePSI;
                     }
                 }
 
@@ -922,14 +910,12 @@ protected static void PropagateBrakeLinePressures(float elapsedClockSeconds, Tra
             if (sumv > 0)
             {
                 sumpv /= sumv;
-                summainrespv /= summainresv;
             }
 
             if (!train.Cars[continuousFromInclusive].BrakeSystem.FrontBrakeHoseConnected && train.Cars[continuousFromInclusive].BrakeSystem.AngleCockAOpen
                 || (continuousToExclusive == train.Cars.Count || !train.Cars[continuousToExclusive].BrakeSystem.FrontBrakeHoseConnected) && train.Cars[continuousToExclusive - 1].BrakeSystem.AngleCockBOpen)
             {
                 sumpv = 0;
-                summainrespv = 0;
             }
 
             // Propagate main reservoir pipe (2) data
@@ -946,7 +932,8 @@ protected static void PropagateBrakeLinePressures(float elapsedClockSeconds, Tra
 
                     train.Cars[i].BrakeSystem.BrakeLine2PressurePSI = sumpv;
                     if (sumpv != 0 && train.Cars[i] is MSTSLocomotive)
-                        (train.Cars[i] as MSTSLocomotive).MainResPressurePSI = summainrespv;
+                        (train.Cars[i] as MSTSLocomotive).MainResPressurePSI = sumpv;
+
                 }
                 else
                 {