Prototype: 6 German State Railroad Company (DRG) four-axle type OOt Saarbrücken / Erz IId (later designation OOtz 43) hopper cars. Version with medium height upper superstructures and brakeman's platforms. Used to transport iron ore. Standard design pressed sheet trucks, without lower beams welded in as reinforcement. The cars look as they did around 1944.
The heavy steam freight locomotive to go with these cars is the class 42 and it can also be found under item number 22225 in the Trix H0 assortment.
A type OOt Saarbrücken / Erz IId hopper car set with 12 additional car numbers can be found in the Märklin H0 assortment under item number 46230 along with information about the required DC wheel sets.