 Cologne Stadtbahn

The Cologne Stadtbahn is a light rail system in the German city of Cologne, including several surrounding cities of the Cologne Bonn Region (Bergisch Gladbach, Bonn, Bornheim, Brühl, Frechen, Hürth, Leverkusen-Schlebusch, Wesseling).The term "Stadtbahn" denotes a system that encompasses elements of trams as well as an underground railway network ("U-Bahn") and interurban rail, even including three lines that are licensed as heavy rail and used by freight trains as well as Stadtbahn vehicles.