PS-2 Two-Bay Covered Hopper - NYC - HO-Scale. Covered Hopper are a railroad freight car designed for carrying dry bulk loads, and were built by most of the freight car manufacturers of the 20th century. Your Bachmann model features include: highly detailed see-through roof walk, separately applied air lines, detailed underbody, blackened metal wheels, body mounted E-Mate couplers, non-magnetic axles.