The set contains wagons to form a mail train of the Deutsche Bundesbahn.

The set contains an express train postal wagon type Post4ü-a17 of the Deutsche Bundespost, a boxcar with brakeman's cab type Grhs 31 and a boxcar type Glmhs 50.

■ With enclosed destination signs for prototypical postal train connection

Earlier in the history of the railways, the postal authorities used the railway to transport mail. The railway mail wagons were either set individually in passenger trains or added in larger numbers as part of express goods- and freight trains for postal services. In the post-war period, the mail trains were characterized by the rolling stock of the former Deutsche Reichspost and the train compositions were formed between large main railway stations. Such mail trains consisted of wagons that served, depending on the design of the wagons, for the transport of letters and postal packages. The mail was not only transported in the postal wagon but already sorted during the journey. Mailings that were already presorted and only had to be distributed at the destination station were transported in boxcars - which were mostly rented by the DB. Sometimes the Deutsche Bundespost used their own wagons.