Prototype: 24 German Federal Railroad (DB) type OOt Saarbrücken and OOtz 44 Erz Id four-axle hopper cars. Version with very low upper superstructure and brakeman's platform. Some of the cars still lettered for the Brit.-US-Zone. Used to transport iron ore. Standard design pressed sheet metal trucks with welded underframes as reinforcement. The cars look as they did around 1952.