The Athearn Trains HO EMD DD-40 Southern Pacific Diesel Locomotive Engine SP 9503 LN is a vintage replica of an Electro-Motive Diesel (EMD) locomotive in 1:87 scale. This model features a 6-6 wheel configuration and is designed to run on a 2-Rail-2-Conductor system. With its analog control system and DC power type, this locomotive is perfect for model railroad enthusiasts looking to add a piece of American rail history to their collection. The Southern Pacific branding adds authenticity to this beautifully detailed and realistic model. Please see photos for condition is unused but in storage for quite some time some discolorization around the edges of the wheels otherwise in great condition