The InterMountain N Scale 69020-04 FT A/B Lehigh Valley Engine 506 and 507 is a pre-built model of two red-colored diesel locomotives in 1:160 scale. These Bo-Bo wheel configuration locomotives are replicas of the FT A/B model and are ready to go on a two-rail system. Made of plastic, these locomotives feature light function and are themed around transportation, with a vintage design from the Lehigh Valley corporate roadname. With an analog control system, this model is perfect for model railroad enthusiasts looking to add realistic locomotives to their collection.