The Vintage 1951 Lionel 6-2023 Union Pacific Alco AA Diesel Locomotive Set is a classic model train engine in the O gauge scale. This ready-to-go pre-built set features a silver color with a Bo-Bo wheel configuration, made of brass, plastic, and diecast materials. The locomotive set has a vintage charm, manufactured in 1951 with a Three-Rail System, analog control system, and features like light function and Magna-Traction. Perfect for collectors and hobbyists, this Lionel set captures the nostalgia of transportation from the 1950s with a touch of Union Pacific Railroad history. This has been in storage for over 30 years. Has not run since then. Sold as is. See photos for all details.