diff --git a/rail.h b/rail.h
--- a/rail.h
+++ b/rail.h
@@ -434,4 +434,13 @@ static inline bool HasSemaphores(TileInd
 	return (_map3_hi[tile] & SIG_SEMAPHORE_MASK);
 }
 
+/**
+ * Return the rail type of tile, or INVALID_RAILTYPE if this is no rail tile.
+ * Note that there is no check if the given trackdir is actually present on
+ * the tile!
+ * The given trackdir is used when there are (could be) multiple rail types on
+ * one tile.
+ */
+RailType GetTileRailType(TileIndex tile, byte trackdir);
+
 #endif // RAIL_H