U1 (Hamburg U-Bahn) · Relations URL: https://knowledge.ivjn.us/en/concepts/ubahn-hamburg-u1/relation.html At 55.4 km in length and with 47 stations, the U1 is the longest line of the Hamburg U-Bahn; running since 1 December 1914 (first section), it operates from Norderstedt Mitte via the city centre to Volksdorf with two branches to Ohlstedt and Großhansdorf. Page 1 / 0, 0 total