diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -25,6 +25,8 @@
 
 #include "table/strings.h"
 
+GroupID _new_group_id;
+
 /**
  * Update the num engines of a groupID. Decrease the old one and increase the new one
  * @note called in SetTrainGroupID and UpdateTrainGroupID
@@ -91,6 +93,8 @@ CommandCost CmdCreateGroup(TileIndex til
 		g->replace_protection = false;
 		g->vehicle_type = vt;
 
+		_new_group_id = g->index;
+
 		InvalidateWindowData(GetWindowClassForVehicleType(vt), (vt << 11) | VLW_GROUP_LIST | _current_company);
 	}