The Lionel 6-18121 Santa Fe F-3 B Unit in blue color is a ready-to-go model designed for O gauge model train enthusiasts aged 17 years and up. This diesel locomotive features an AC power type, analog control system, and a three-rail system for operation. Made of plastic and in a 1:48 scale, this locomotive is a part of the Santa Fe corporate roadname and was manufactured in the United States during the 1990s by the well-known brand Lionel.