These very distinctive cars are the railroad equivalent of a dump truck. Designed to carry up to 100 tons, they are fitted with large pneumatic cylinders and side doors, and can dump to the left or right of the tracks. While used primarily in work train service for dumping ballast, fill and rip rap, they can also be used in revenue service to carry sand, gravel, cinders, coal, limestone and other loose bulk materials used in industry. Cars come in plastic display box, equipped with AccuMate trucks/couplers. Photos courtesy of William K. Walthers.