(svn r15583) -Fix: Do not use TILE_MASK when you do not want to wrap around them map.

src/newgrf_commons.cpp

@@ -292,7 +292,7 @@ TileIndex GetNearbyTile(byte parameter, TileIndex tile)
 	/* Swap width and height depending on axis for railway stations */
 	if (IsRailwayStationTile(tile) && GetRailStationAxis(tile) == AXIS_Y) Swap(x, y);
 
-	/* Make sure we never roam outside of the map */
+	/* Make sure we never roam outside of the map, better wrap in that case */
 	return TILE_MASK(tile + TileDiffXY(x, y));
 }