What is Hamburg U-Bahn?
{{Infobox Public transit |name = Hamburg U-Bahn |image = U-Bahn.svg |imagesize = 70px |image2 = U-Bahnhof HafenCity Universität Bahnsteig 2.jpg |imagesize2 = 340px |caption2 = [[HafenCity Universität (Hamburg U-Bahn station)|HafenCity Universität Station]] of Hamburg U-Bahn |box_width = auto |owner = Hamburger Hochbahn AG, <br />Verkehrsgesellschaft [[Norderstedt]]<br/>(Norderstedt Mitte – Garstedt) |locale = [[Hamburg]], [[Norderstedt]],<br/>[[Ahrensburg]], [[Großhansdorf]] |transit_type = [[Rapid transit]] |lines = 4 |stations = 93 |ridership = 664,380 |annual_ridership = 242.5 million <small>(2017)</small><ref>[https://www.hochbahn.de/hochbahn/wcm/connect/de/ec6b04d4-d4fb-4b58-91db-e4abf393b41f/180615_hbn_ub17_image_save.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE.Z18_JH8I1JC0L05M10AEB6TSP430A1-ec6b04d4-d4fb-4b58-91db-e4abf393b41f-mgSH2sG Unternehmensbericht 2017] {{Webarchive|url=https://web.archive.org/web/20200312204128/https://www.hochbahn.de/hochbahn/wcm/connect/de/ec6b04d4-d4fb-4b58-91db-e4abf393b41f/180615_hbn_ub17_image_save.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE.Z18_JH8I1JC0L05M10AEB6TSP430A1-ec6b04d4-d4fb-4b58-91db-e4abf393b41f-mgSH2sG |date=2020-03-12 }} p.69</ref> |website = {{url|https://www.hochbahn.de/hochbahn/hamburg/en|www.hochbahn.de}} |began_operation = {{start date and age|1912|2|15|df=y}} |ended_operation = |operator = [[Hamburger Hochbahn AG]] |marks = |vehicles = 245 trains<ref>{{cite web |title=Hochbahn Annual Report 2015 |url=http://kiosk.hochbahn.de/hochbahn-annual-report-2015/55688464/17 |publisher=Hamburger Hochbahn |access-date=16 March 2017 |archive-date=17 March 2017 |archive-url=https://web.archive.org/web/20170317234930/http://kiosk.hochbahn.de/hochbahn-annual-report-2015/55688464/17 |url-status=dead }}</ref> |train_length = ~{{convert|120|m|ft}} |headway = 5 minutes (rush hour 3 min) |system_length = {{convert|106.4|km