The passenger cars 23, 24 and 26 were built in 1919 by the Hannoversche Waggonfabrik AG, Hannover-Linden (HAWA) according to the construction guidelines of the army field railways of the First World War.

Some car bodies were discovered by the SKBG at the Glasmoor prison, where they were used as recreation rooms.

The first of the three car bodies came to Holm-Seppensen at the end of 1973, the others followed later. Suitable bogies were obtained from the Muskau forest railway (DR), which was closed in 1978.

In the past, wagons of this type were used for transporting personnel (22 persons) or as hospital wagons (8 stretchers). The front sides could be opened up completely to bring the wounded inside more easily. This is still possible today on carriages 23 and 24.

Passenger car 23 has been in service with the DFKM since August 1978, while the restoration of car 24 was completed in April 1980. In October 1989, the refurbishment of passenger car 26 started. The wagon 26 was previously canibalised as a spare part donor for the cars 23 and 24. After a complete overhaul and refurbishment, the car is back in operation in the museum since Easter 1990.

In 2014, the body of passenger car 23 was refurbished and the entire wooden superstructure was replaced.