The Athearn 2171 Santa Fe Budd RDC-1 Powered Unit is a vintage model train engine in mint condition and boxed. It is a replica of the Santa Fe Budd RDC with a silver color and Bo-Bo wheel configuration, made of plastic and metal materials. This HO scale engine is ready to go with an analog control system and two-rail system, perfect for collectors aged 17 years and up who enjoy transportation-themed model railroads.