Add Delay Calculation for Stopped Trains

Add a delay calculation for trains stopped at stations when they are delayed past their departure time (trains that are meant to be waiting for more than 1 minute shouldn't get negative delays).
Add comment explaining why existing delay calculation remains.

Author: TheGwyd

Source/Orts.Simulation/Simulation/Timetables/TTTrain.cs

@@ -10198,6 +10198,12 @@ public override void CheckStationTask()
                 int presentTime = Convert.ToInt32(Math.Floor(Simulator.ClockTime));
                 int eightHundredHours = 8 * 3600;
                 int sixteenHundredHours = 16 * 3600;
+				
+				// Update delay if train might be running late, do not update if train is early and waiting at station 
+				if (presentTime > StationStops[0].DepartTime)
+				{
+					Delay = TimeSpan.FromSeconds((presentTime - StationStops[0].DepartTime) % (24 * 3600));
+				}
 
                 // If moving, set departed
                 if (Math.Abs(SpeedMpS) > 1.0f)
@@ -10207,6 +10213,7 @@ public override void CheckStationTask()
                     AtStation = false;
                     MayDepart = false;
                     DisplayMessage = "";
+					// Update delay when departing, train may now be early
                     Delay = TimeSpan.FromSeconds((presentTime - StationStops[0].DepartTime) % (24 * 3600));
 
                     // Check for activation of other train