Atlas Master 20006736 HO ACF 5701 Covered Hopper, DOWX #37445Atlas Master 20006736 HO ACF 5701 Covered Hopper, DOWX #37445 Part Number: 840245202117 Description Atlas Master 20006736 HO ACF 5701 Covered Hopper, DOWX #37445 Atlas Master 20006736 HO ACF 5701 Covered Hopper, DOWX #37445 The 5701 cubic foot covered hopper was introduced in the early Seventies for transporting bulk plastic pellets. Since 1972 ACF has built nearly 15,000 cars. Most of these were acquired by private companies including leasing