Electric railcar ET 91 01 "Gläserner Zug" "Glass train" of the Deutsche Bundesbahn.

■ In red-beige livery
■ With built-in interior lighting as standard

To make travels 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, the DRG considered it essential to stand up to the increasing competition from buses in the excursion traffic sector. The aim of building the railcars was to provide all passengers with a free and unobstructed view of the landscape. Additionally to the three diesel-hydraulic vehicles, the DRG ordered two more railcars for electric operation. The wagon manufacturer H. Fuchs Waggonfabrik in Heidelberg was responsible for the mechanical part, the AEG from Berlin supplied the electrical components.

Both railcars ET 91 01 and 02, which were given the melodious name "Gläserner Zug" ("Glass train") by the public, quickly established themselves among the passengers. Popular excursions were the Karwendel Round Trip via Mittenwald to Innsbruck or the Alpine Round Trip via Salzburg, Bischofshofen and Kufstein to Munich.