ACF 5250 Covered Hopper

Prototype Information

American Car and Foundry (ACF) introduced the 5250 cubic foot Center Flow covered hopper in the 1960s to modernize dry bulk transport. While it became a staple for the plastics industry, the 5250 also played a vital role in grain handling. Its unique pear-shaped cross-section eliminated the center sill, which created a smooth interior without corners or obstructions. This design prevented grain from getting trapped and rotting, a common problem in older square-sided hoppers. The Center Flow design ensured that every bushel of wheat or corn could flow freely through the gravity discharge gates at the bottom of the car.

For grain service, ACF equipped these cars with long “trough” hatches on the roof instead of the round hatches used for chemicals. This allowed elevators to load grain in one continuous motion as the car moved beneath the loading spout. The 5250’s large capacity allowed railroads to move massive volumes of feed and grain across the Midwest during the agricultural booms of the 1970s. Although the 4750 cubic foot hopper eventually became the more common standard for heavy grain, the 5250 remained a versatile workhorse. Its efficient design helped transition the industry away from labor-intensive 40′ boxcars and toward the high-speed unit grain trains used today.