Prototype: Ten (10) German Federal Railroad (DB) four-axle type Erz Id hopper cars from the OOtz 44 design. Version with very low upper bodies and brakeman's platforms. Some still lettered Brit.-US Zone (three (3) cars). Used to transport iron ore. Standard design welded pressed sheet metal trucks, with girders welded in place as reinforcement. The cars look as they did around 1952.