Pennsylvania Railroad Class H21a 4-bay open hoppers were also owned by and decorated for several other railroads, affiliates and coal companies. Bowser N Scale cars are based on the cars operated from 1911 into the 1960s and later in maintenance service, so they're suitable for service on your steam or diesel-era railroad. The Class H21a 4-bay open hoppers feature removable molded coal loads and feature PRR appropriate trucks, metal wheels and magnetic knuckle couplers.