The Lionel 6-18919 Santa Fe Alco A Unit Non-Powered Diesel Engine is a highly detailed replica of a Santa Fe locomotive in O gauge. This non-powered diesel engine is perfect for model train enthusiasts looking to expand their collection with a classic and iconic piece. With its original box included, this Lionel engine is a must-have for collectors and hobbyists alike who appreciate the craftsmanship and history of model railroads.