U2 (Hamburg U-Bahn) · Relations URL: https://knowledge.ivjn.us/en/concepts/ubahn-hamburg-u2/relation.html The U2 is a 24.5 km long line of the Hamburg U-Bahn with 25 stations; its first section was opened on 21 October 1913, and it runs from Niendorf Nord via the city centre to Mümmelmannsberg. Page 1 / 0, 0 total