diff --git a/roadveh_cmd.c b/roadveh_cmd.c
--- a/roadveh_cmd.c
+++ b/roadveh_cmd.c
@@ -191,6 +191,7 @@ int32 CmdBuildRoadVeh(TileIndex tile, ui
 		v->random_bits = VehicleRandomBits();
 
 		VehiclePositionChanged(v);
+		GetPlayer(_current_player)->num_engines[p1]++;
 
 		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
 		RebuildVehicleLists();