Vintage postcards of the old opera house at Rudolfplatz in Cologne with Opernhaus Gaststätte (oper house restaurant), built from 1900 onwards, was slightly damaged in 1943 and could have been rebuilt after the war (the black and white image was subsequently colorized using AI). The tram train pictured consists of so-called "Ringbahnwagen" (ring tram cars), which were in service from 1928 onwards. It consists of a motor car (of which there were 54) at the front and rear, and a trailer car (of which there were 27) coupled between them. To shorten the waiting time at the stops, passengers boarding and disembarking were separated. Boarding was permitted only through the center door, and disembarkation was permitted exclusively through the doors on the front and rear platforms.
