MTH: 20-89025 Premier End-of-Train Device Roller Bearing Truck (White) O Gauge This long requested accessory can convert any M.T.H. Premier Line freight car to an end-of-train car in just a few minutes. The all die-cast sprung loaded roller bearing truck includes a self--powered electronic circuit that powers a bright flashing LED resulting in an end-of-train effect found on modern freight drags. The ETD truck easily mounts to your existing freight cars in just a few minutes. Features: Die-Cast Construction Fully Assembled Self-Powered Strobe Light Mounts To Any M.T.H. Freight Car Unit Measures: 1” High