This is a modern version of the Lionel #145 postwar automatic gateman. When a train approaches the gateman emerges from his shanty to warn motorists of the oncoming train. It uses a track contactor but will also work with an insulated track section, which is sold separately. It comes fully assembled and ready to go. It measures 7 inches x 5 3/4 inches x 4 3/4 inches. For O-gauge trains. New in the box, complete with all parts and instructions.