U6 (Berlin U-Bahn) · Relations URL: https://knowledge.ivjn.us/en/concepts/ubahn-berlin-u6/relation.html The U6 is a 19.9 km long line of the Berlin U-Bahn with 29 stations, opened on 30 January 1923, connecting Alt-Tegel in Tegel with Alt-Mariendorf in a north–south direction via Friedrichstraße and Tempelhof. Page 1 / 0, 0 total