At the start of the 1950s the new German Federal Railroad reached back to the prewar tradition of the legendary FD trains (long distance express trains) and came up with a new train class with the F-Zgen (international long distance express trains and domestic long distance express trains). These consists were run almost exclusively with 1st class cars and consisted of special cars for important long distance service. The route network for these trains was also called the "blue long distance train network" because of the blue paint scheme for these passenger cars. The muted red of the Mitropa dining cars used on these trains contrasted effectively with the rest of the cars provided the typically dignified look of these long distance trains so highly valued by passengers in the 1950s and 60s of the last century.
The cars have imprinted train destination signs. All of the cars have factory-installed interior lighting with warm white LEDs. One car has a factory-installed pickup shoe and red marker lights. The entire car consist can be provided with power by means of the factory-installed current-conducting close couplers. A permanently defined sequence of the cars is given for this. Minimum radius for operation is 360 mm / 14-3/16".