The MTH 20-97060 Union Pacific 6 Car Hopper Set is a pre-built model train accessory featuring brown plastic and diecast material in 1:48 scale. It is designed for O gauge rail systems and represents the Union Pacific Railroad. This set includes 6 individually numbered hoppers, perfect for adding realistic detail to your model railroad layout. Made by MTH, a trusted brand in model railroads, this coal hopper set is a great addition for collectors and hobby enthusiasts looking to expand their train collection with high-quality and accurately detailed freight cars.