This product is a HO Scale Proto 2000 21668 PRR Pennsylvania ALCO PB Diesel #5754B, which is an unpowered model designed for collectors and enthusiasts of model railroads. It features a 1:87 scale plastic construction with very little wheel wear, and comes in its original box with all paperwork included. The locomotive is factory painted with a realistic Pennsylvania train operating company design, making it a desirable addition to any HO scale railroads and trains collection.