The Athearn HO Southern Pacific SD40 Locomotive 93587 is a ready-to-go pre-built model of a diesel locomotive in 1:87 scale. Made of plastic and featuring an analog control system, this two-rail system locomotive is designed for model railroads and trains enthusiasts aged 17 years and up. With a vintage Southern Pacific corporate roadname and painted features, this Athearn brand locomotive adds a realistic touch to transportation-themed layouts.