diff --git a/src/train.h b/src/train.h
--- a/src/train.h
+++ b/src/train.h
@@ -273,6 +273,8 @@ int CheckTrainStoppedInDepot(const Vehic
 void UpdateTrainAcceleration(Vehicle* v);
 void CheckTrainsLengths();
 
+void FreeTrainTrackReservation(const Vehicle *v, TileIndex origin = INVALID_TILE, Trackdir orig_td = INVALID_TRACKDIR);
+
 /**
  * This class 'wraps' Vehicle; you do not actually instantiate this class.
  * You create a Vehicle using AllocateVehicle, so it is added to the pool