Correctly parse AntiSlip() token

Author: cesarBLG

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

@@ -1105,7 +1105,7 @@ public override void Parse(string lowercasetoken, STFReader stf)
                 case "engine(dynamicbrakesresistorcurrentlimit": DynamicBrakeMaxCurrentA = stf.ReadFloatBlock(STFReader.UNITS.Current, null); break;
                 case "engine(numwheels": MSTSLocoNumDrvWheels = stf.ReadFloatBlock(STFReader.UNITS.None, 4.0f); if (MSTSLocoNumDrvWheels < 1) STFException.TraceWarning(stf, "Engine:NumWheels is less than 1, parts of the simulation may not function correctly"); break;
                 case "engine(ortsnumberdriveaxles": LocoNumDrvAxles = stf.ReadIntBlock(null); if (LocoNumDrvAxles < 1) STFException.TraceWarning(stf, "Engine:ORTSNumberDriveAxles is less than 1, parts of the simulation may not function correctly"); break;
-                case "engine(antislip": AntiSlip = stf.ReadBoolBlock(false); break;
+                case "engine(antislip": AntiSlip = stf.ReadBoolBlock(true); break;
                 case "engine(ortsdrivewheelweight": InitialDrvWheelWeightKg = stf.ReadFloatBlock(STFReader.UNITS.Mass, null); break;
                 case "engine(engineoperatingprocedures": EngineOperatingProcedures = stf.ReadStringBlock(""); break;
                 case "engine(headout":