The Proto2000 St. Louis & SW 21670/21671/21690 PA A/B/A Locomotive Set #300/301/5910 is a highly detailed and well-crafted model of diesel locomotives in 1:87 scale. This limited edition set features a replica of the ALCO locomotives in the Saint Louis Southwestern corporate roadname. Made from a combination of plastic and diecast materials, the locomotives are ready to go with light function and painted in realistic colors. The set runs on a two-rail system using analog control, making it a perfect addition to any HO scale model railroad collection. Little to no run time. Came out of a living estate. All detail parts in boxes.