The Athearn HO Southern Pacific Black Widow GP9 #406 Diesel Locomotive is a 1:87 scale model powered by DC. It features the famous Black Widow paint scheme with B-B wheel configuration and is made of plastic and metal materials. This ready-to-go pre-built locomotive comes with light function and is part of the transportation theme. The Southern Pacific corporate roadname adds authenticity to this detailed model, perfect for model railroad enthusiasts aged 17 years and up. Leave it heavily weathered or clean it to your taste. EXCELLENT Runner with brass flywheels, extra details, and K-D couplers.