The MTH Premier 20-2177-3 Southern F3 B Unit Diesel Nonpowered is a ready-to-go model of a Southern Railway diesel locomotive from the year 2000. This 1:48 scale locomotive is made of plastic, steel, and diecast materials, with a white and green color scheme. It is part of the Three-Rail System and features a dummy control unit suitable for collectors aged 17 years and up. Made by MTH, this non-powered unit is a must-have for model railroads and train enthusiasts looking to add a vintage piece to their collection.