The Proto 2000 SD9 Locomotive Conrail 6921 is a model train engine in HO scale, designed for enthusiasts aged 17 years and up. Made of plastic and painted in blue, this ready-to-go pre-built locomotive is manufactured around the year 2000 and features an analog control system. With a two-rail system for battery operation, this locomotive is perfect for collectors and hobbyists interested in transportation-themed model railroads. Produced by the brand PROTO 2000, this locomotive embodies the vintage charm of Conrail's corporate roadname. new in box never opened