In 1976 the German Federal Railroad placed the prototype (car number 51 80 89-80 600-5) of a new, comfortable generation of entertainment cars into service. These type WGmh 824 cars were planned to set new standards for the highest level of comfort in relation to adventure trips, rolling conferences, or excursion trips. At one end of the car was two compartments for train officials as well as a toilet, at the other end a galley with an adjoining bar. One of the two compartments for train officials served as a technology space with music equipment and control of the lighting installation. Approximately two thirds of the car was planned as entertainment space and could be used as a dining room, conference room, or dance area. Only one small seating corner was permanently installed at one end of this space. Otherwise, the interior could be arranged to meet the requirements of the occasion. Themes from cities in Lower Saxony decorated the side walls of the entertainment space. The bulkhead walls by contrast had an intertwined pattern in different colors.
The car ran on Minden-Deutz type 36 trucks and was rated for 160 km/h / 100 mph. Its underframe was built in the customary manner with a frame, cross members, and plates constructed of steel. Its car body was a welded design with side walls, end walls, and roof plates. However, cross bracing had to be installed to accommodate extreme variations in the load under certain circumstances (such as during dance events) in the entertainment area. Right from the time it was placed into service, the entertainment car ran in the DB standard paint scheme of ocean blue / ivory that was current at that time.