This is a Walthers 920-42377 HO Scale UP AB Diesel Locomotive Set 961/961B W/DCC. These items include a plastic body construction as well as metal wheels and plastic knuckle couplers. Manufacturer: Walthers. Model Number: 920-42377. Road Name: Union Pacific (UP). MSRP: 569.98. Scale/Era: HO Scale. Model Type: Diesel Loco. Availability: Ships within 1 Business Day! Trainz Product Id: 12428359.