--- a/src/vehicle.h	Sat May 19 09:13:08 2007 +0000
+++ b/src/vehicle.h	Sat May 19 09:40:18 2007 +0000
@@ -310,6 +310,8 @@
 	TileIndex cargo_loaded_at_xy;  ///< tile index where feeder cargo was loaded
 	uint32 value;
 
+	GroupID group_id;              ///< Index of group Pool array
+
 	union {
 		VehicleRail rail;
 		VehicleAir air;