Player train start time stashed

Fix for some scenarios where this value gets overwritten and the loader bar disappears.

Author: Chris Jakeman

Source/Orts.Simulation/Simulation/AIs/AI.cs

@@ -374,8 +374,8 @@ private void PrerunAI(int playerTrainOriginalTrain, TTTrain.FormCommand playerTr
                 bool activeTrains = false;
                 for (double runTime = firstAITime; runTime < Simulator.ClockTime && !endPreRun; runTime += 5.0) // update with 5 secs interval
                 {
-                    var loaderSpan = (float)playerTrain.StartTime - firstAITime;
-                    Simulator.TimetableLoadedFraction = ((float)clockTime - firstAITime) / loaderSpan;
+                    var loaderSpan = (float)TimetableInfo.PlayerTrainOriginalStartTime - firstAITime;
+                    Simulator.TimetableLoadedFraction = ((float)runTime - firstAITime) / loaderSpan;
 
                     int fullsec = Convert.ToInt32(runTime);
                     if (fullsec % 3600 < 5) Trace.Write(" " + (fullsec / 3600).ToString("00") + ":00 ");

Source/Orts.Simulation/Simulation/Timetables/ProcessTimetable.cs

@@ -80,6 +80,8 @@ private enum rowType
 
         public bool BinaryPaths = false;
 
+        public static int? PlayerTrainOriginalStartTime; // Set by TimetableInfo.ProcessTimetable() and read by AI.PrerunAI()
+
         //================================================================================================//
         /// <summary>
         ///  Constructor - empty constructor
@@ -171,7 +173,7 @@ public List<TTTrain> ProcessTimetable(string[] arguments, CancellationToken canc
                     addPathNoLoadFailure = playerTrain.ProcessDisposeInfo(ref trainList, null, simulator);
                     if (!addPathNoLoadFailure) loadPathNoFailure = false;
                 }
-
+                PlayerTrainOriginalStartTime = playerTrain.StartTime; // Saved here for use after playerTrain.StartTime gets changed.
                 reqPlayerTrain = InitializePlayerTrain(playerTrain, ref Paths, ref trainList);
                 simulator.TrainDictionary.Add(reqPlayerTrain.Number, reqPlayerTrain);
                 simulator.NameDictionary.Add(reqPlayerTrain.Name.ToLower(), reqPlayerTrain);