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The U4 is the only line of the Frankfurt Stadtbahn that operates at least partially as a full underground train. It runs completely independently between Bockenheimer Warte and Seckbacher Landstraße. Every second service continues to Enkheim. The majority of the entire route runs underground. Frankfurt Stadtbahn: • [Documentary] Frankfurt U-Bahn (2018) Frankfurt Tram: • [Documentary] Frankfurt a. M. Tram (2... My Instagram: / _bahnwelten Music: none