(svn r24071) -Fix [FS#5093]: Reversing trains while they were entering or leaving a depot could lead to stuck trains.

src/pbs.cpp

@@ -369,7 +369,8 @@ Train *GetTrainForReservation(TileIndex tile, Track track)
  */
 bool IsSafeWaitingPosition(const Train *v, TileIndex tile, Trackdir trackdir, bool include_line_end, bool forbid_90deg)
 {
-	if (IsRailDepotTile(tile)) return true;
+	/* A depot is safe if we enter it, but not when we exit. */
+	if (IsRailDepotTile(tile) && TrackdirToExitdir(trackdir) != GetRailDepotDirection(tile)) return true;
 
 	if (IsTileType(tile, MP_RAILWAY)) {
 		/* For non-pbs signals, stop on the signal tile. */

src/train_cmd.cpp

@@ -2200,6 +2200,8 @@ void FreeTrainTrackReservation(const Train *v, TileIndex origin, Trackdir orig_t
 	bool      free_tile = tile != v->tile || !(IsRailStationTile(v->tile) || IsTileType(v->tile, MP_TUNNELBRIDGE));
 	StationID station_id = IsRailStationTile(v->tile) ? GetStationIndex(v->tile) : INVALID_STATION;
 
+	/* A train inside a depot can't have a reservation. */
+	if (v->track == TRACK_BIT_DEPOT) return;
 	/* Don't free reservation if it's not ours. */
 	if (TracksOverlap(GetReservedTrackbits(tile) | TrackToTrackBits(TrackdirToTrack(td)))) return;