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.
The class 42 heavy steam freight locomotive to go with these cars can be found under item numbers 39042 and 39043 in the Märklin H0 assortment.
An Erz Id hopper car set with another 12 car numbers can be found in a DC version in the Trix H0 assortment under item number 24120.