(svn r16324) [0.7] -Backport from trunk:

- Fix: Desyncs due to the fact that depot searching with a maximum search depth simply does not work with YAPF's caches [FS#2900] (r16323)
- Fix: Trains could get stuck in a depot when they wanted to go to the same depot again [FS#2873] (r16322)
- Fix: In the scenario editor change the (starting) game year of the scenario, not the (starting) game year for new games/scenarios (r16321)
- Fix: Loading of savegames created in revision between 0.3.5 and 0.3.6 caused crash (r16320)
- Fix: [NoAI] Set the autorenew settings for new AI companies to the default values, not to 0 or the local settings (r16316)
- Fix: [NewGRF] Allow accessing the house age when the house is not yet built (r16314)
- Fix: (Get|Set)TrackBits() is only valid for RAIL_TILE_NORMAL and _SIGNALS (r16311)

src/train_cmd.cpp

@@ -2383,6 +2383,15 @@ static bool CheckTrainStayInDepot(Vehicle *v)
 		seg_state = _settings_game.pf.reserve_paths ? SIGSEG_PBS : UpdateSignalsOnSegment(v->tile, INVALID_DIAGDIR, v->owner);
 	}
 
+	/* We are leaving a depot, but have to go to the exact same one; re-enter */
+	if (v->tile == v->dest_tile) {
+		/* We need to have a reservation for this to work. */
+		if (GetDepotWaypointReservation(v->tile)) return true;
+		SetDepotWaypointReservation(v->tile, true);
+		VehicleEnterDepot(v);
+		return true;
+	}
+
 	/* Only leave when we can reserve a path to our destination. */
 	if (seg_state == SIGSEG_PBS && !TryPathReserve(v) && v->u.rail.force_proceed == 0) {
 		/* No path and no force proceed. */