The MTH 20-21879-1 CSX AC6000 Diesel with Proto 3 is a scale model of a diesel locomotive designed for model railroads. This pre-built locomotive features a digital control system, smoke unit, light function, and sound function. The multicolor plastic model, measuring 1:48 scale, is suitable for collectors aged 17 years and up. With its three-rail system compatibility and MTH DCS technology, this locomotive simulates the CSX Transportation corporate roadname, providing a realistic replica of a modern diesel train.