Butch, also known as the "Sodor Heavy Recovery Unit", is a breakdown vehicle. He is kept busy in construction areas, clearing rubble, towing broken-down or stranded vehicles, or assisting in engine rescues.
Butch is based on a Scammel tank recovery vehicle. According to the official website, he was constructed out of parts from a diesel, a lorry, and a crane.
Butch is painted yellow and navy blue, with "Sodor Heavy Recovery Unit" written on both sides in white. Since Misty Island Rescue, he has the logo of the Sodor Search and Rescue Centre on his cab doors.