" Version in red-beige paintwork
With built-in interior lighting as standard / In order to make travelling and excursions more attractive again for the German population in the early 1930s, the then Deutsche Reichsbahn-Gesellschaft (DRG) decided to build a total of five observation railcars. At the time, it was important for the DRG to be able to stand up to the increasing competition from buses in excursion traffic. The aim in building the railcars was to give all passengers as free and unobstructed a view of the landscape as possible. In addition to three diesel-hydraulic vehicles, two were ordered for electric operation. The H. Fuchs Waggonfabrik in Heidelberg was responsible for the mechanical part. The electrical part was supplied by AEG, Berlin.
Both railcars ET 91 01 and 02, which were given the melodious name "Gläserner Zug" (glass train) by the public, quickly established themselves among passengers. Popular
popular excursions were the Karwendel round trip via Mittenwald to Innsbruck or the Alpine round trip via Salzburg, Bischofshofen and Kufstein to Munich."