U9 (Berlin U-Bahn) · Relations URL: https://knowledge.ivjn.us/en/concepts/ubahn-berlin-u9/relation.html The U9 is a 12.5 km long, fully underground line of the Berlin U-Bahn with 18 stations, opened on 28 August 1961, connecting Osloer Straße in Gesundbrunnen via Zoologischer Garten with Rathaus Steglitz. Page 1 / 0, 0 total