ACF 50'-6" OUTSIDE BRACED SLIDING DOOR BOX CAR -CONRAIL - N Scale. American Car and Foundry (ACF) is one of the largest manufacturers of railroad box cars. The box car is a versatile freight car since it can carry most loads. 50’ Sliding Door Box Cars were used by a wide variety of railroads and other commercial companies. Bachmann’s Sliding Door Box Cars come in a variety of colors and road names. Each car is fully assembled and features; Moveable Sliding Door, Highly Detailed Painted Bodies with Precision Graphics (where applicable), Blackened Machined Metal Wheels with RP 25 Contours, Magnetically Operated E-Z Mate Couplers, Non-magnetic Blackened Brass Axles with Needle-point Bearings, Celcon Trucks, and Added Weight for Optimum Tracking Performance.