diff --git a/src/rail.h b/src/rail.h
--- a/src/rail.h
+++ b/src/rail.h
@@ -281,4 +281,9 @@ RailType GetRailTypeByLabel(RailTypeLabe
  */
 void ResetRailTypes();
 
+/**
+ * Allocate a new rail type label
+ */
+RailType AllocateRailType(RailTypeLabel label);
+
 #endif /* RAIL_H */