Atlas 20006904 Master Plus HO ACF 5250 4-Bay Covered Hopper, Amoco #6228Atlas 20006904 Master Plus HO ACF 5250 4 Bay Covered Hopper, Amoco #6228 Part Number: 840245212154 Description Atlas Master Plus HO ACF 5250 4 Bay Covered Hopper, Amoco #6228 Atlas Item #: 20006904 ACF introduced the 5250 cubic foot size covered hopper in 1964, and has since built nearly 20,000 cars. Most of the cars were equipped with pneumatic outlets and eight 20" round hatches for use in transporting plastic pellets. In addition to the plastics