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((short description|Rapid transit system in Hamburg, Germany))
((Use dmy dates|date=December 2019))
((More citations needed|date=August 2008))
((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<ref name="hvv data">((cite web |url=http://www.hochbahn.de/wps/portal/de/home/hochbahn/unternehmen/die_hochbahn/unternehmen_auf_einen_blick?WCM_PORTLET=PC_7_QI5C5I930GON002FVCDEUT00Q4_WCM&WCM_GLOBAL_CONTEXT=/wps/wcm/connect/de/home/hochbahn/unternehmen/die_hochbahn/unternehmen_auf_einen_blick |title=Die Hochbahn auf einen Blick|publisher=Hamburger Hochbahn |language=de |trans-title=A View of the U-Bahn |year=2012 |access-date=30 September 2013 |url-status=dead |archive-url=https://web.archive.org/web/20131021154907/http://www.hochbahn.de/wps/portal/de/home/hochbahn/unternehmen/die_hochbahn/unternehmen_auf_einen_blick?WCM_PORTLET=PC_7_QI5C5I930GON002FVCDEUT00Q4_WCM&WCM_GLOBAL_CONTEXT=%2Fwps%2Fwcm%2Fconnect%2Fde%2Fhome%2Fhochbahn%2Funternehmen%2Fdie_hochbahn%2Funternehmen_auf_einen_blick |archive-date=21 October 2013 |df=dmy-all ))</ref><ref name="annual-report-2012" />
|stations         = 93<ref name="hvv data" /><ref name="annual-report-2012" />
|ridership        = 664,380 <small>(2017)</small>
|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] 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))<ref name="history1" />
|ended_operation  = 
|operator         = [[Hamburger Hochbahn AG]]
|marks            = 
|vehicles         = 245 trains<ref name="hvv data" /><ref group="note">Number of vehicles without maintenance trains.</ref><br />861 cars<ref name="annual-report-2015">((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))</ref>
|train_length     = ~((convert|120|m|ft))
|headway          = 5 minutes (rush hour 3 min)
|system_length    = ((convert|106.4|km|mi|1|abbr=on))<ref name="railwaypro.com">((cite web|url=https://www.railwaypro.com/wp/hamburg-opens-u4-extension/|title=Hamburg opens U4 extension|website=www.railwaypro.com|date=13 December 2018|access-date=11 August 2020))</ref>
|el               = 750 V DC [[Third rail]]
|track_gauge      = ((RailGauge|sg))<br />([[standard gauge]])
|average_speed    = 
|top_speed        = ((convert|80|km/h|mph|abbr=on))
|map              = ((Hamburg U-Bahn route diagram))
|map_state        = collapsed
))

The '''Hamburg U-Bahn''' is a [[rapid transit]] system serving the cities of [[Hamburg]], [[Norderstedt]], and [[Ahrensburg]] in Germany. Although referred to by the term U-Bahn (the "U" commonly being understood as standing for ((lang|de|Untergrund)) "underground"), most of the system's track length is above ground. The network is interconnected with the [[Hamburg S-Bahn|city's S-Bahn system]], which also has underground sections. It is operated by [[Hamburger Hochbahn]] within the [[Hamburger Verkehrsverbund]] (HVV). It was opened in February 1912,<ref name="history1">((cite web |url=http://www.hochbahn.de/wps/portal/de/home/hochbahn/unternehmen/historie/?WCM_PORTLET=PC_7_QI5C5I930GON002FVCDEUT00A7000000_WCM&WCM_GLOBAL_CONTEXT=/wps/wcm/connect/de/home/hochbahn/unternehmen/historie/ |title=Historie der Hochbahn|publisher=Hamburger Hochbahn |language=de |trans-title=History of the U-Bahn |year=2013 |access-date=30 September 2013 |url-status=dead |archive-url=https://web.archive.org/web/20131021153320/http://www.hochbahn.de/wps/portal/de/home/hochbahn/unternehmen/historie/?WCM_PORTLET=PC_7_QI5C5I930GON002FVCDEUT00A7000000_WCM&WCM_GLOBAL_CONTEXT=%2Fwps%2Fwcm%2Fconnect%2Fde%2Fhome%2Fhochbahn%2Funternehmen%2Fhistorie%2F |archive-date=21 October 2013 |df=dmy-all ))</ref> and comprises four lines serving 93 stations,<ref name="annual-report-2012">((cite web|url=http://www.hochbahn.de/wps/wcm/connect/a7981d00404d5dd89462d4ccf66c0340/130624_HHA_UB12_E_online.pdf?MOD=AJPERES |title=Hochbahn – Annual Report 2012 – Thinking Further! Turning Visions into Reality|publisher=Hamburger Hochbahn|website=hochbahn.de<!-- dead link: (via: http://www.hochbahn.de/wps/portal/de/home/hochbahn/unternehmen/die_hochbahn/unternehmen_unternehmensbericht/) -->|page=4|year=2012|access-date=30 September 2013|url-status=dead|archive-url=https://web.archive.org/web/20140426201711/http://www.hochbahn.de/wps/wcm/connect/a7981d00404d5dd89462d4ccf66c0340/130624_HHA_UB12_E_online.pdf?MOD=AJPERES|archive-date=26 April 2014|df=dmy-all))</ref> with a route length of ((convert|106.4|km|mi)) in 2019.<ref name="railwaypro.com"/>

== History ==
In 1906 the [[Senate of Hamburg]] awarded a contract for the Elevated and Underground Railway to [[Siemens|Siemens & Halske]] and [[AEG (German company)|AEG]] of Berlin. The first stretch was completed on 7 October 1906.
This was followed in 1911 with the founding of the ''Hamburger Hochbahn Aktiengesellschaft'' (HHA). Thus Hamburg became the third German city (after Berlin, 1902 and [[Schöneberg]], [[U4 (Berlin U-Bahn)|1910]]) to have a [[Rapid transit in Germany#U-Bahn|U-Bahn]] (then known as the Elevated and Underground Railway (Hoch- und Untergrundbahn) as it is largely either elevated or in tunnels – not much at street level).

The construction of such a railway had long been discussed, meanwhile an elevated train was also considered. In 1906 a circular route was begun, connecting ''[[Hamburg Hauptbahnhof]] – Berliner Tor – Barmbek (earlier spelling: Barmbeck) – Kellinghusenstraße – Schlump – [[Landungsbrücken]] (earlier designation: Hafentor) – Rathaus – Hauptbahnhof'' with branches to the quarters of [[Eimsbüttel]], [[Ohlsdorf, Hamburg|Ohlsdorf]] and [[Rothenburgsort]]. On 15 February 1912 the first stretch of the future ''Ringbahn'' (Circle railway) between ''[[Hamburg Rathaus|Rathaus]]'' station and ''Barmbek'' was inaugurated. The stretch included both underground and elevated sections.

<gallery mode="packed" heights="120">
File:U-Bahnhof Überseequartier Bahnsteig von Zwischenebene gesehen.jpg|Übersee-<br />quartier station
File:Hamburg.UKlosterstern.wmt.jpg|Klosterstern station
File:Hamburg U-Bahn Hauptbahnhof Nord.JPG|Hauptbahnhof Nord station
File:U-Bahnhof Steinstraße 1.jpg|Steinstraße station
</gallery>

=== Network development ===

By 1915 the Ringbahn and the three spurs, from ''[[Kellinghusenstraße station|Kellinghusenstraße]]'' to ''Ohlsdorf'', from ''Schlump'' to ''Hellkamp'' (today: disused station between ''Oster-'' and ''Lutterothstraße'') and from central station to ''Rothenburgsort'' were completed. By 1934 the extensions from ''Ohlsdorf'' to ''Ochsenzoll'' (''[[Langenhorn, Hamburg|Langenhorn]]er Bahn''), from ''Kellinghusenstraße'' to ''[[Jungfernstieg railway station|Jungfernstieg]]'' (KellJung line), and the ''Walddörferbahn'' (Forestvillages line) from ''Barmbek'' to ''[[Großhansdorf]]'' and ''Ohlstedt'' were completed.

In 1943, during the Second World War the subway was badly damaged during 'Operation Gomorrha,' the [[Bombing of Hamburg in World War II|RAF bombing of Hamburg]] that summer. The stretch from ''Hauptbahnhof'' to ''Rothenburgsort'' was not repaired because the district it passed through had been completely destroyed.<ref>((cite web|url=http://www.gleismann.de/2.hochroth/11.abbau.html|title=Gleismannsbahnhof Gleis 2.11 - Die Hochbahn nach Rothenburgsort / Die Zerstörung und der Abbau der Zweiglinie|website=www.gleismann.de|language=de|access-date=11 August 2020))</ref> It was five more years before the remaining network was once more completely intact.

Further additions to the network were made, starting in 1960. The KellJung line was extended via [[Meßberg (Hamburg U-Bahn station)|Meßberg]] to the central station (Hauptbahnhof). Later in 1962 the extension reached ''[[Hamburg-Wandsbek|Wandsbek]] Markt'' and in 1963 ''Wandsbek-Gartenstadt''. The total network length was ((convert|67.9|km|0)).

The construction of a ''Durchmesserstrecke'' (diameter route) began in 1963. The plan was to connect [[Billstedt]] with Stellingen. The Eimsbüttel branch formed the western part of the line. The branch was extended up to ''[[Tierpark Hagenbeck|Hagenbecks Tierpark]]'' in 1966. The existing terminus at ''Hellkamp'' was withdrawn from service in 1964 and a new station was built at ''Lutterothstraße'' further northwest.

The connection between [[Berliner Tor railway station|Berliner Tor]] and [[Horner Rennbahn]] was opened in 1967. In the same year this eastern branch was extended to ''Legienstraße''. Further extensions took place in 1969 to ''Billstedt'' and in 1970 towards ''Merkenstraße''. The extension ''Ochsenzoll – Garstedt'' came into service in May 1969. Thus, the network total length reached ((convert|88.5|km|0|abbr=on)).

A new core stretch of the line ''[[U2 (Hamburg U-Bahn)|U2]]'', between ''Schlump'' and ''Berliner Tor'', became a direct connection through the city centre. Next to be brought into service were sections from ''Hauptbahnhof Nord'' to ''Berliner Tor'' in 1968, and from ''Schlump (low)'' to ''Gänsemarkt'' in 1970, then the last section, with two new platforms on the lowest level at the station ''Jungfernstieg'' under the [[Binnenalster]], in 1973. This station, as well as ''Hauptbahnhof Nord'', was developed as part of the ''U4'' line that was planned at that time.

In 1985 the section to ''Hagenbecks Tierpark'' was extended to ''Niendorf Markt'' and again in 1991 as far as ''[[Niendorf Nord (Hamburg U-Bahn station)|Niendorf&nbsp;Nord]]''. In 1990 the extension ''Merkenstraße – Mümmelmannsberg'' was opened. The line extension opened in 1996 between ''[[Norderstedt|Garstedt]]'' and ''[[Norderstedt Mitte (Hamburg U-Bahn station)|Norderstedt Mitte]]'', which replaced the southern part of the [[Alster Northern Railway|Alsternordbahn]].

In 2005 the Hamburg U-Bahn had a length of some ((convert|100.7|km|0)), of which ((convert|40|km|0|abbr=on)) are underground. It had 89&nbsp;station stops.

In 2009, the [[U3 (Hamburg U-Bahn)|U3]], beginning in Barmbek, traversed the complete ring line, thereby taking over the stretch between Berliner Tor and Barmbek, which was formerly served by the U2. In order to realise a problem-free service, a redesign of the current track layout to the west of Berliner Tor was necessary. An originally planned [[Grade separation|grade separated crossing]] of the two lines was realised, which was left undone before due to cost. Trains coming from the city centre leave the ring at Barmbek and continue via the viaduct stretch to Wandsbek Gartenstadt. One branch leads via the Walddörferbahn to Wandsbek-Gartenstadt, a stretch formerly served by the U2.<ref>((cite web |url=http://www.abendblatt.de/hamburg/article1064777/Wegen-Linientausch-U-Bahnen-fahren-nicht.html |title=Wegen Linientausch: U-Bahnen fahren nicht |date=23 June 2009 |access-date=18 August 2009 |language=de|work=[[Hamburger Abendblatt]]))</ref>

In 2012, the [[U4 (Hamburg U-Bahn)|U4]] started operations between Billstedt and [[HafenCity Universität (Hamburg U-Bahn station)|HafenCity University]], sharing most of its route with the U2 and thereby increasing service on the highly used line between [[Berliner Tor station|Berliner Tor]] and [[Billstedt (Hamburg U-Bahn station)|Billstedt]]. The U4 was extended further east to Elbbrücken in December 2018, providing a future S-Bahn connection.<ref>((Cite web|url=https://www.hochbahn.de/hochbahn/hamburg/de/Home/Naechster_Halt/Ausbau_und_Projekte/u_bahn_ausbau/U4_Verlaengerung_Elbbruecken/Bauplan%20und%20Baukalender|title=Extension of the U4|website=Extension of the U4|publisher=Hamburger Hochbahn|language=de|access-date=19 September 2016))</ref><ref>((Cite news|url=https://www.ndr.de/nachrichten/hamburg/Neue-U-Bahn-Station-Elbbruecken-eroeffnet,elbbruecken212.html|title=Neue U-Bahn-Station Elbbrücken eröffnet|date=6 December 2018|work=Norddeutscher Rundfunk|access-date=26 October 2019|language=de))</ref>
((Clear))
<gallery mode="packed" heights="120">
File:Hamburger Hochbahn - Entwicklungsgeschichte.png|Map showing the network development
File:DT3 U-Bahn U3 Baumwall Abend - 6289-f6.jpg|U-Bahn station ″Baumwall″, rolling stock type [[DT3]]
File:DT4 U-Bahn U4 Überseequartier - 3928-df3.jpg|U-Bahn ″Überseequartier″, rolling stock type [[DT4]]
File:Hamburg U-Bahn Hochbahn.JPG|Hamburger Hochbahn on the ''Vorsetzen''
</gallery>

== Future development ==

=== Abandoned projects ===

The eastern branch of the "Walddörferbahn" was originally intended to terminate at the station ''Beimoor'', just to the north of ''Großhansdorf'', in order to connect a proposed housing development to the public transport system. By the time work was abandoned, the station platform had already been finished and tracks had been laid. Today the remains of the station are used as a winter home for [[bat]]s in the middle of a [[Biotope|dry grass biotope]].

Plans for a fourth line have been discussed since the 1970s. In those days it was planned for the line to lead from City Nord and Uhlenhorst via the city centre (Hauptbahnhof Nord and Jungfernstieg) and [[Altona, Hamburg|Altona]] to Lurup and [[Osdorfer Born]]. In order to link the green-field housing development at Osdorfer Born to the rest of the city as quickly as possible, a limited service on the stretch between ''Altona'' und Osdorfer Born was planned. Until the connection with the rest of the network was ready, it was intended to transport trains to the main service depot in Barmbek by [[flatbed truck]]s for maintenance. Platforms and track beds for this stretch were completed in the stations Hauptbahnhof Nord and [[Jungfernstieg railway station|Jungfernstieg]]. Preparations for tunnel constructions were made in the area of [[Hamburg-Altona railway station]] and under the motorway [[Bundesautobahn 7|A&nbsp;7]] in Bahrenfeld.
In preparation for the junction with the [[U1 (Hamburg U-Bahn)|U1]], an extra platform was built at the new station Sengelmannstraße. All these constructions remain unused to this day.

The northern surplus platform area at Hauptbahnhof&nbsp;Nord is currently used for the art installation ''Sterne'' by Raimund Kummer and Stefan Huber. Here several concrete stars lie over the whole platform area as if they had fallen from the sky. At the same time the southern surplus platform area is still unused in any kind of way in 2018, displaying the station as it was opened in 1968 since changes in terms of advertising spaces, station signs etc. were never applied there. However, none of those two unused platforms are accessible as they are locked with fences. Today both unused platforms appear deteriorated and large segments of the wall coverings are missing, which is because the complete station already suffered from water damage in the 1970s (and, to a smaller extent, still frequently does so today) and it was necessary to remove those segments in order to fix the leaking ceiling and walls. This also had to be done at the U2 platforms, but as those have been in service, the coverings were mounted to the walls again after all repairs were finished.
((Clear))
<gallery mode="packed" heights="120">
File:U-bahn-hauptbahnhof-nord.jpg|Abandoned part of Hauptbahnhof&nbsp;Nord
File:140807S1.jpg|Installation Hauptbahnhof Nord
File:Hamburg U-Bahn Beimoor.JPG|Remains of the U-Bahn station Beimoor
</gallery>

=== Current projects ===
In 2015 major subway extension plans were published. They include
* building a new branch from [[Horner Rennbahn (Hamburg U-Bahn station)|Horner Rennbahn]] to Horner Geest with two stations, transferring the eastern terminus of the U4 from Billstedt to the new branch terminus<ref>((Cite web|url=https://www.hochbahn.de/hochbahn/hamburg/de/Home/Naechster_Halt/Ausbau_und_Projekte/u_bahn_ausbau/u4-verlaengerung_horner_geest|title=U4-Verlängerung Horner Geest|website=www.hochbahn.de|access-date=2016-09-19))</ref>
* building a whole new U5 line running from [[Osdorfer Born]] in the west of Hamburg to [[Bramfeld]] in the east via [[Uhlenhorst]], representing a modified and extended version of the old U4 plans from the 1970s. The first part of the route is intended to be built between [[Sengelmannstraße (Hamburg U-Bahn station)|Sengelmannstrasse]] and Bramfeld between 2022 and 2028.<ref>((Cite web|url=https://www.hochbahn.de/hochbahn/hamburg/de/Home/Naechster_Halt/Ausbau_und_Projekte/u_bahn_ausbau/u5_ost_bramfeld|title=U5 Ost Bramfeld – City Nord|website=www.hochbahn.de|access-date=2016-09-19))</ref>

Original plans also called for the U4 to be extended southward to the [[Hamburg S-Bahn|S-Bahn]] station [[Harburg Rathaus station|Harburg Rathaus]] via [[Wilhelmsburg, Hamburg|Wilhelmsburg]], in order to provide a second rapid transit line to serve the south of Hamburg and relieve the busy S3/S31 that is - since its opening in 1983 - the only rapid transit service for the complete borough of [[Harburg, Hamburg|Harburg]] and nowadays operates at its capacity limit.<ref>((Cite news|url=https://www.welt.de/regionales/hamburg/article1497240/U4-soll-in-fuenf-Jahren-nach-Wilhelmsburg-fahren.html|title=Nahverkehr: U4 soll in fünf Jahren nach Wilhelmsburg fahren|last=Kopp|first=Martin|date=27 December 2007|work=DIE WELT|access-date=2018-07-17))</ref> These plans are subject of discussions in 2018 still, no actual plans have been made so far. However, the new Elbbrücken station has been constructed in a way that allows a further extension of the line in the future.

== Network ==
The Hamburg U-Bahn consists of four lines:

{| class="wikitable"
|- valign=top
! Line
! Route
! Trains used
! First<br />opened
! Length<br />(km)
! Stations
|-
| style="background-color:#((rcr|Hamburg U-Bahn|U1));text-align:center;font-weight:bold" | ((Coloredlink|white|U1 (Hamburg U-Bahn)|U1))
| [[Norderstedt Mitte (Hamburg U-Bahn station)|Norderstedt Mitte]] – [[Jungfernstieg station|Jungfernstieg]] – Hauptbahnhof Süd – [[Ohlstedt (Hamburg U-Bahn station)|Ohlstedt]] / [[Großhansdorf (Hamburg U-Bahn station)|Großhansdorf]]
| style="text-align:center;" | DT3 (rarely), DT4, DT5
| style="text-align:center;" | 1914
| style="text-align:center;" | 55.4&nbsp;km
| style="text-align:center;" | 46
|-
| style="background-color:#((rcr|Hamburg U-Bahn|U2));text-align:center;font-weight:bold" | ((Coloredlink|white|U2 (Hamburg U-Bahn)|U2))
| [[Niendorf Nord (Hamburg U-Bahn station)|Niendorf Nord]] – [[Jungfernstieg station|Jungfernstieg]] – Hauptbahnhof Nord – [[Mümmelmannsberg (Hamburg U-Bahn station)|Mümmelmannsberg]]
| style="text-align:center;" | DT4
| style="text-align:center;" | 1913
| style="text-align:center;" | 24.5&nbsp;km
| style="text-align:center;" | 25
|-
| style="background-color:#((rcr|Hamburg U-Bahn|U3));text-align:center;font-weight:bold" | ((Coloredlink|black|U3 (Hamburg U-Bahn)|U3))
| [[Barmbek station|Barmbek]] – ''Circle'' – Barmbek – [[Wandsbek-Gartenstadt (Hamburg U-Bahn station)|Wandsbek-Gartenstadt]]
| style="text-align:center;" | DT3 (rarely), DT5
| style="text-align:center;" | 1912
| style="text-align:center;" | 20.7&nbsp;km
| style="text-align:center;" | 25
|-
| style="background-color:#((rcr|Hamburg U-Bahn|U4));text-align:center;font-weight:bold" | ((Coloredlink|white|U4 (Hamburg U-Bahn)|U4))
|  [[Elbbrücken station|Elbbrücken]] – [[Jungfernstieg station|Jungfernstieg]] – Hauptbahnhof Nord – [[Billstedt (Hamburg U-Bahn station)|Billstedt]]
| style="text-align:center;" | DT4, DT5
| style="text-align:center;" | 2012
| style="text-align:center;" | 13.3&nbsp;km
| style="text-align:center;" | 11
|-
| colspan="4" style="text-align:center;" | '''Total:'''
| style="text-align:center;" | '''106.4&nbsp;km'''
| style="text-align:center;" | '''91'''
|}

{| class="wikitable" cols="3" cellspacing="0"
! bgcolor="#EEEEEE" | Line
! bgcolor="#EEEEEE" | Stretches from <br /> North / West<br /> to South / East
! bgcolor="#EEEEEE" | Stops <br />(Terminal stations in bold)
|-
! style="background-color:#((rcr|Hamburg U-Bahn|U1));text-align:center;font-weight:bold;color:white;" rowspan="8"| U1
| align="center" | ''Langenhorner Bahn''
| '''[[Norderstedt Mitte (Hamburg U-Bahn station)|Norderstedt Mitte]]''' ''(A2)'' – [[Richtweg (Hamburg U-Bahn station)|Richtweg]] – '''Garstedt''' – '''Ochsenzoll''' – Kiwittsmoor – Langenhorn&nbsp;Nord – Langenhorn&nbsp;Markt – '''Fuhlsbüttel&nbsp;Nord''' – Fuhlsbüttel – Klein&nbsp;Borstel – '''[[Ohlsdorf station|Ohlsdorf]]''' ''(S1)''
|-
| align="center" | ''Ohlsdorf branch''
| '''[[Ohlsdorf station|Ohlsdorf]]''' – Sengelmannstraße – Alsterdorf – '''Lattenkamp''' – Hudtwalckerstraße – '''[[Kellinghusenstraße (Hamburg U-Bahn station)|Kellinghusenstraße]]''' ''(U3)''
|-
| align="center" | ''KellJung-Linie''
| '''[[Kellinghusenstraße (Hamburg U-Bahn station)|Kellinghusenstraße]]''' – Klosterstern – Hallerstraße – '''Stephansplatz''' ''(Dammtor: S2, S5)'' – '''[[Jungfernstieg station|Jungfernstieg]]''' ''(U2, U4, S1, S3, [[Alster]] ferries, Rathaus: U3)''
|-
| align="center" | ''Meßberglinie''
| [[Jungfernstieg station|Jungfernstieg]] – [[Messberg (Hamburg U-Bahn station)|Meßberg]] – Steinstraße – '''[[Hamburg Hauptbahnhof|Hauptbahnhof&nbsp;Süd]]''' ''(U3, S1, S2, S3, S5)''
|-
| align="center" | ''Wandsbek extension''
| '''[[Hamburg Hauptbahnhof|Hauptbahnhof Süd]]''' – [[Lohmühlenstraße (Hamburg U-Bahn station)|Lohmühlenstraße]] – '''Lübecker Straße''' ''(U3)'' – '''Wartenau''' – Ritterstraße – Wandsbeker Chaussee ''(S1)'' – '''Wandsbek&nbsp;Markt''' – Straßburger Straße – Alter Teichweg – '''Wandsbek-Gartenstadt''' ''(U3)''
|-
| align="center" rowspan="3" | ''Walddörferbahn''
| '''Wandsbek-Gartenstadt''' – Trabrennbahn – '''Farmsen''' – Oldenfelde – '''Berne''' – Meiendorfer Weg – '''[[Volksdorf (Hamburg U-Bahn station)|Volksdorf]]'''
|-
| '''[[Volksdorf (Hamburg U-Bahn station)|Volksdorf]]''' – Buckhorn – Hoisbüttel – '''[[Ohlstedt (Hamburg U-Bahn station)|Ohlstedt]]'''
|-
| '''[[Volksdorf (Hamburg U-Bahn station)|Volksdorf]]''' – Buchenkamp – Ahrensburg West – Ahrensburg&nbsp;Ost – Schmalenbeck – Kiekut – '''[[Großhansdorf (Hamburg U-Bahn station)|Großhansdorf]]'''
|-
| colspan="3" bgcolor="#EEEEEE" align="center" style="color:white" | &nbsp;
|-
! style="background-color:#((rcr|Hamburg U-Bahn|U2));text-align:center;font-weight:bold;color:white;" rowspan="4"| U2
| align="center" | ''Niendorf extension''
| '''[[Niendorf Nord (Hamburg U-Bahn station)|Niendorf Nord]]''' – Schippelsweg – Joachim-Mähl-Straße – '''Niendorf&nbsp;Markt''' – Hagendeel – '''Hagenbecks&nbsp;Tierpark'''
|-
| align="center" | ''Eimsbüttel branch''
| '''Hagenbecks Tierpark''' – Lutterothstraße – Osterstraße – Emilienstraße – '''Christuskirche''' – '''[[Schlump (Hamburg U-Bahn station)|Schlump]]''' ''(U3)''
|-
| align="center" | ''Diameter route''
| '''Schlump''' – '''Messehallen''' – Gänsemarkt – [[Jungfernstieg station|Jungfernstieg]] ''(U1, U4, S1, S3, [[Alster]] ferries)'' – [[Hamburg Hauptbahnhof|Hauptbahnhof&nbsp;Nord]] ''(U4, S1, S2, S3, S5)'' – '''[[Berliner Tor station|Berliner&nbsp;Tor]]''' ''(U3, U4, S1, S2)''
|-
| align="center" | ''Billstedt branch''
| '''[[Berliner Tor station|Berliner Tor]]''' – Burgstraße – '''Hammer Kirche''' – Rauhes Haus – '''Horner Rennbahn''' – Legienstraße – '''[[Billstedt (Hamburg U-Bahn station)|Billstedt]]''' – Merkenstraße – Steinfurther Allee – '''[[Mümmelmannsberg (Hamburg U-Bahn station)|Mümmelmannsberg]]'''
|-
| colspan="3" bgcolor="#EEEEEE" align="center" style="color:white" | &nbsp;
|-
! style="background-color:#((rcr|Hamburg U-Bahn|U3));text-align:center;font-weight:bold"  rowspan="2"| U3
| align="center" | ''Ring <br />(Circle Line)''
| '''[[Barmbek station|Barmbek]]''' ''(U3, S1)'' – '''Saarlandstraße''' – Borgweg – Sierichstraße – '''[[Kellinghusenstraße (Hamburg U-Bahn station)|Kellinghusenstraße]]''' ''(U1)'' – Eppendorfer Baum – Hoheluftbrücke – '''Schlump''' ''(U2)'' – [[Sternschanze railway station|Sternschanze]] ''(S2, S5)'' – Feldstraße – '''St. Pauli''' – [[Landungsbrücken station|Landungsbrücken]] ''(S1, S3, [[Elbe]] ferries)'' – Baumwall – Rödingsmarkt – '''Rathaus''' ''(Jungfernstieg: U1, U2, U4, S1, S3)'' – Mönckebergstraße – [[Hamburg Hauptbahnhof|Hauptbahnhof&nbsp;Süd]] ''(U1, S1, S2, S3, S5)'' – '''[[Berliner Tor station|Berliner&nbsp;Tor]]''' ''(U2, U4, S1, S2)'' – '''Lübecker&nbsp;Straße''' ''(U1)'' – Uhlandstraße – '''Mundsburg''' – Hamburger Straße – Dehnhaide – '''[[Barmbek station|Barmbek]]''' ''(U3, S1)''
|-
| align="center" | ''Walddörferbahn''
| '''Barmbek''' – Habichtstraße – '''Wandsbek-Gartenstadt''' ''(U1)''
|-
| colspan="3" bgcolor="#EEEEEE" align="center" style="color:white" | &nbsp;
|-
! style="background-color:#((rcr|Hamburg U-Bahn|U4));text-align:center;font-weight:bold;color:white;" rowspan="3"| U4
| align="center" | ''HafenCity line''
|'''[[Elbbrücken station|Elbbrücken]]''' ''(S3, S5)'' – '''[[HafenCity Universität (Hamburg U-Bahn station)|HafenCity Universität]]''' – [[Überseequartier (Hamburg U-Bahn station)|Überseequartier]] – [[Jungfernstieg station|Jungfernstieg]] ''(U1, U2, S1, S3)''
|-
| align="center" | ''Diameter route''
|   [[Jungfernstieg station|Jungfernstieg]] – [[Hamburg Hauptbahnhof|Hauptbahnhof Nord]] ''(U2, S1, S2, S3, S5)''
|-
| align="center" | ''Billstedt branch''
| [[Hamburg Hauptbahnhof|Hauptbahnhof Nord]] – '''[[Berliner Tor station|Berliner Tor]]''' ''(U2, U3, S1, S2)'' – Burgstraße – '''Hammer Kirche''' – Rauhes Haus – '''Horner&nbsp;Rennbahn''' – Legienstraße – '''[[Billstedt (Hamburg U-Bahn station)|Billstedt]]'''
|-
! style="background-color:grey;text-align:center;font-weight:bold;color:white;" rowspan="1"| <s>U</s>
| align="center" | ''Rothenburgsorter Hochbahn''
<br /><small>closed in 1943 after the viaduct and the surrounding houses were destroyed in [[World War II]]</small>
| '''Hauptbahnhof Süd''' ''(U1, U3, S1, S2, S3, S5)'' – Spaldingstraße – Süderstraße – Brückenstraße – '''[[Rothenburgsort]]''' ''(S2)''
|}

The line names ''U1'' und ''U2'' were introduced with the timetable change on 22 May 1966, the name ''U3'' followed on 2 January 1967. Until the completion of the direct inner-city stretch, the future ''U2'', on 3 June 1973, the partial services on the already completed eastern (''Hauptbahnhof Nord − Berliner Tor (− Barmbek)'' since 29 September 1968) and western (''Schlump − Gänsemarkt'' since 31 May 1970) sections were known as ''U21'' and ''U22'' respectively.

=== U4 project ===
((main|U4 (Hamburg U-Bahn)))
Hamburger Hochbahn opened the new line U4 in November 2012. There had been an ongoing discussion about the costs and the benefit of this line, but the government of Hamburg decided to build it nevertheless. The underground line was dug using the same machinery as for the building of the new tunnel of the [[Elbe Tunnel (1975)|Elbe tunnel]].<ref>Website U4 project, see external links</ref>

=== Services ===
Services operate with a 5 or 10-minute frequency with the exception of the northeastern peripheral branches of U1 that have a 10 or 20-minute frequency. During peak times the frequency is increased to 3/3/4-minute or even 2/3-minute patterns. Since the timetable change in December 2004 the U-Bahn operates an all-night, 20-minute service interval on Friday and Saturday nights. From Sunday to Thursday the U-Bahn operates from 4&nbsp;am to about 1&nbsp;am.

== Stations ==
((See also|List of Hamburg U-Bahn stations))

<gallery widths=180>
Image:U-Bahnhof Joachim-Mähl-Straße 5.jpg|Joachim-Mähl-Strasse station
Image:U-Bahnhof Niendorf Markt 2.jpg|Niendorf Markt station
Image:U-Bahnhof Hagendeel 4.jpg|Hagendeel station
Image:U-Bahnhof Gänsemarkt 1.jpg|Gänsemarkt station
Image:U-Bahnhof Jungfernstieg 1.jpg|Jungfernstieg station
File:U-Bahnhof Uhlandstraße 5.jpg|Uhlandstrasse station
File:Hamburg - U-Bahnhof Mundsburg Bahnsteig.jpg|Mundsburg station
File:U-Bahnhof Ritterstraße 1.jpg|Ritterstrasse station
File:U-Bahnhof Wartenau 1.jpg|Wartenau station
File:U-Bahnhof Stephansplatz 2.jpg|Stephansplatz station
</gallery>

=== Hamburg Hauptbahnhof ===
[[Hamburg Hauptbahnhof]] is a central junction with the [[Rail transport|mainline railway]], and, due to the confluence of all U-Bahn lines and all S-Bahn lines, an important interchange for suburban public transport as well.

Tunnels for the first underground railway were constructed at the same time as the Hauptbahnhof itself. The tunnels run underneath the mainline tracks, which are themselves below street level. The current U3 stops at this station, which, for more clarity, is now known as ''Hauptbahnhof&nbsp;Süd''. There is also an underground pedestrian tunnel parallel to the U3 circle line tunnel, which allowed a quick connection to the mainline platforms until the major part of it was closed off in 1991. The remaining part of the tunnel can still be used today to reach the S-Bahn platforms.

The unusual width of the vaulted station is due to the fact that it originally housed four tracks; the Rothenburgsort branch, which was destroyed in World War&nbsp;II and never rebuilt, used to begin here. The inner tracks remained in service until the 1970s and were used to terminate additional service trains until the trackbeds were covered to create one wide instead of two narrow platforms. The tracks that led up the ramp to the decommissioned line were used as layup tracks during that time. In 1960 the tunnel leading to the ramp was cut off as the then-built U1 tunnel crosses right through it.

The tunnels for the U1 were driven under the mainline railway next to the U3 tunnels in 1959, the platform for the U1 lies directly south to the U3 and is accessible via the same station entrances.

The opening of the line U2 (U21 in 1969) lead to the construction of a further underground station ''Hauptbahnhof Nord'' to serve it. The station is ((convert|30|m|0)) below the surface; in the direction of the [[Jungfernstieg railway station|Jungfernstieg]] station, the tunnels pass under the ''[[Aussenalster]]'', an artificial lake. The two outer platforms remain unused since their construction and were originally intended for a proposed U-Bahn line between [[Altona, Hamburg|Altona]]/[[Lurup]] and Winterhude/City&nbsp;Nord (see above).

== Operating company ==
((Main|Hamburger Hochbahn))
The system is owned and operated by the Hamburger Hochbahn (HHA), except the Garstedt – [[Norderstedt Mitte (Hamburg U-Bahn station)|Norderstedt Mitte]] section, which is owned by the ''Verkehrsgesellschaft Norderstedt'' (VGN) but also operated by the Hamburger Hochbahn.

== Rolling stock ==
The Hamburg U-Bahn uses standard gauge electric multiple units that run on third rail with 750 volts DC. The current fleet mostly consists of trains that had been developed from the 1950s to 1980s. In 2012, newly developed trains were introduced. A typical Hamburg U-Bahn train is made up of six (U3 line), eight or nine cars (all other lines). Trains with four cars can also be found during weekends or late nights.

=== Current rolling stock ===

==== Type DT3 ====
The [[HHA Type DT3|Type DT3]] was introduced in 1968 to shorten the journey time on the U1 line. A total of 127 units were built from 1966 to 1971. 68 units were rebuilt from 1994 to 2001 and received a new front design, they are called DT3E (E = ertüchtigt = rebuilt, in this case). Six units (921–926) kept their original red front designed in the 1960s, they were equipped with [[Linienzugbeeinflussung|LZB]] for semi-automatic operation between 1981 and 1985. The other 59 units were retired and scrapped due to structural issues and were replaced by new DT4 trains between 1995 and 2003, one unit (909) is being preserved to be restored and used as a museum train once all DT3 are retired. Between 2008 and 2011, most of the 68 remaining units received an interior refurbishing once again.

The prototype unit and the last built unit were converted to [[induction motor]]s around 1980 (being called DT3-DAT from then), in order to test this new technology for the upcoming order of the new DT4 series. They operated in revenue service until 1989 and were scrapped in 1995 (932) and 2000 (931).

As the DT3 is currently the oldest train type in the system, new DT5 trains are replacing them since 2013 and retirement has started in late 2015. By July 2018 28 of once 127 DT3 trains are still in service, only running on additional rush-hour services as regular service ended in Summer 2017. All six DT3-LZB units were retired in December 2016 because of their rusting bodies and the worn-out interiors (no DT3-LZB received the 2008 redesign), they were scrapped together with several refurbished units in 2017.

10 units are being rebuilt once again at FWM in [[Hennigsdorf]] to serve as an operational reserve for about 10 more years. They receive small propulsion modifications, the interior redesign of 2008 (most of those units were not refurbished back then), improved departure signals and structural issues of the wearing car bodies are being fixed. The newly rebuilt cars are called "DT3N", in order to distinguish them from the regular DT3E cars as the technical modifications render electric coupling between both types impossible when running in revenue service.<ref>((Cite web|url=http://www.nahverkehrhamburg.de/hamburgs-aelteste-u-bahnen-werden-modernisiert-3451/|title=Hamburgs älteste U-Bahnen werden modernisiert|date=14 June 2016|language=de-DE|access-date=2016-09-19))</ref>

==== Type DT4 ====
The [[HHA Type DT4|Type DT4]] was introduced in 1988 to replace the Type DT1, most of the DT2 trains and some DT3 trains. The Type DT4 came with a more futuristic design, reduced noise, increased safety and greater economy than the older trains. A total of 126 units were built in six batches from 1988 to 2005. Due to the long construction span the batches slightly differ from each other in terms of interior and exterior design, propulsion and destination signs. Also the first two batches had doors operated by handles, which were replaced by buttons around 2004.

Since 2011 the older DT4 trains are being refurbished as the oldest units are almost 30 years old already, by July 2018 the first 50 of 126 units have been refurbished. Additionally the electrical equipment (including propulsion) of the units 141 and 143–150 has been replaced by the equipment used in the sixth and youngest batch in order to receive spare parts for the aging first two batches, making mixed usage of these units with any other batch than the sixth impossible as their propulsion is incompatible to the one used in older units.

==== Type DT5 ====
The [[Hamburg U-Bahn Type DT5|Type DT5]] was introduced in 2012 to completely renew the current rolling stock. By July 2018, 89 of 118 planned units have been built and delivered. The Type DT5 is the first type of U-Bahn trains in Hamburg with air-conditioning and [[open gangway]]s between the cars. More DT5 units were ordered than necessary for replacement of all DT2E and DT3E units, in order to enlarge the total number of cars in revenue service to be able to provide additional service in the future.

<gallery>
File:DT3 U-Bahn Hamburg U3 Baumwall - 3623-3f4.jpg|Type DT3-LZB (retired in 2016)
File:HHA DT3 - 804-III.JPG|Type DT3E (refurbished, retiring since 2015)
File:U-Bahnhof Burgstraße 5.jpg|Type DT4
File:HHA DT5 - 306-III.JPG|Type DT5
</gallery>

=== Former rolling stock ===

==== Type T/TU ====
The [[HHA Type A|HHA Type T]] was introduced with the Hamburg U-Bahn itself. Nearly 400 cars were built from 1911 to 1943. Some cars were destroyed in World War II; these cars were rebuilt from 1947 to 1949 and signed as Type TU1. To raise the economy, another 100 cars were rebuilt from 1959 to 1961 and signed as TU2. The passenger service for the T/TU-type ended in 1970, some cars were converted to working service cars and were used until the 1980s. Five cars are preserved for museum rides, four of them in service and one awaiting restoration.

==== Type DT1 ====
The [[HHA Type DT1|Type DT1]] was used from 1958 to 1991 in revenue service. A total of 100 cars (or 50 units) were produced. The Type DT1 had a much better acceleration than the T-type; however, their high energy consumption caused by their high weight left the Hamburger Hochbahn in dissatisfaction with the new trains, moving them into rush-hour service only in the 1970s. Most units were scrapped after their retirement while some cars were converted into working trains (retired in 2005) and three units were preserved for museum rides: The first one (516) was rebuilt between 1997 and 2000 and is used as a bar train that can be chartered for events. The second unit (512) awaits restoration until today, while the third unit (518) donates spare parts to both the other units. As the restoration of 512 has not begun by July 2018 (it is unknown whether the restoration will actually take place someday), 516 serves as the de facto DT1 museum unit.

==== Type DT2 ====
The [[HHA Type DT2|Type DT2]] was introduced in 1962 to replace the Type T trains. After the experiences with the heavy DT1 trains they were constructed as light-weight cars with weaker engines to save energy. A total of almost 200 units were built from 1960 to 1966. Most of them also were rebuilt in the 1980s and 1990s as their lifespan was actually only intended to be 20–25 years. The refurbished units were called DT2E, however, only the last two of five batches received a full refurbishment together with a new front design. All cars of the first three batches were retired between 1997 and 2002, with the third batch already been taken out of service in 1994 as they slightly differed from the other units (also as only two of 15 DT2.3 were rebuilt). After the official retirement in 2004, 15 units remained in service as an operational reserve. Those were retired on 28 November 2015 after being replaced by new DT5 trains. One non-refurbished unit is preserved for museum rides but has not been sent into restoration yet (2018).

<gallery>
File:DSCF0987.jpg|Type T, retired in the 1960s
File:HHA TU1 - 8838-III.JPG|Type TU1, retired in 1970
File:U-Bahn HH DT1 PA140160.JPG|Type DT1, retired in 1991
File:Hamburg DT2 02.jpg|Type DT2 (original), retired in 2002
File:Hamburg DT2 04.jpg|Type DT2E (rebuilt), retired in 2015
</gallery>

== Network Map ==
((Rapid transit OSM map
| system_qid   = Q6445
| frame-lat    = 53.616
| frame-long   = 10.06
| frame-width  = 750
| frame-height = 470
| zoom         = 11
| length       = yes
))

== See also ==
* [[List of Hamburg U-Bahn stations]]
* [[Hamburg S-Bahn]]
* [[AKN Eisenbahn|AKN railways plc]]
* [[Transport in Hamburg#Public transport|Public transport in Hamburg]]

== Notes ==
((Reflist|group="note"))

== References ==
((Reflist))

== External links ==
((Commons|Hamburg U-Bahn))
* ((Official website|http://www.hochbahn.de/|Hamburger Hochbahn official website)) Operator of the Hamburger U-Bahn
* [http://www.hochbahnbuch.de Die Geschichte der Hamburger Hochbahn] Book by André Loop
* [https://web.archive.org/web/20100804071641/http://u4.hochbahn.de/planen-bauen Current and historical Plans for the U4]
* [https://public-transport.net/metro/Hamburg/index.html Hamburg's underground]  - a picture site at ''public-transport.net''

((Hamburg rail|lineS1=|lineS11=|lineS2=|lineS21=|lineS3=|lineS31=|lineU1=yes|lineU2=yes|lineU3=yes|lineU4=yes))
((Urban public transport in Germany))
((Underground rapid transit in the European Union))

[[Category:Hamburg U-Bahn| ]]
[[Category:Rail transport in Hamburg|U-Bahn]]
[[Category:Underground rapid transit in Germany]]
[[Category:Railway lines opened in 1912]]
[[Category:1912 establishments in Germany]]
[[Category:750 V DC railway electrification]]

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Module:Convert (view source) (template editor protected)
Module:Convert/data (view source) (template editor protected)
Module:Convert/text (view source) (template editor protected)
Module:Date (view source) (template editor protected)
Module:Disambiguation/templates (view source) (protected)
Module:Exponential search (view source) (template editor protected)
Module:Find sources (view source) (template editor protected)
Module:Find sources/config (view source) (template editor protected)
Module:Find sources/links (view source) (template editor protected)
Module:Find sources/templates/Find sources mainspace (view source) (template editor protected)
Module:Format link (view source) (template editor protected)
Module:Hatnote (view source) (template editor protected)
Module:Hatnote/styles.css (view source) (template editor protected)
Module:Hatnote list (view source) (template editor protected)
Module:Infobox (view source) (template editor protected)
Module:Infobox/styles.css (view source) (template editor protected)
Module:InfoboxImage (view source) (template editor protected)
Module:Labelled list hatnote (view source) (template editor protected)
Module:Lang (view source) (template editor protected)
Module:Lang/ISO 639 synonyms (view source) (template editor protected)
Module:Lang/data (view source) (template editor protected)
Module:Language/data/iana languages (view source) (template editor protected)
Module:Language/data/iana regions (view source) (template editor protected)
Module:Language/data/iana scripts (view source) (template editor protected)
Module:Language/data/iana suppressed scripts (view source) (template editor protected)
Module:Language/data/iana variants (view source) (template editor protected)
Module:Mapframe (view source) (template editor protected)
Module:Message box (view source) (protected)
Module:Message box/ambox.css (view source) (protected)
Module:Message box/configuration (view source) (protected)
Module:Namespace detect/config (view source) (protected)
Module:Namespace detect/data (view source) (protected)
Module:Navbar (view source) (protected)
Module:Navbar/configuration (view source) (protected)
Module:Navbar/styles.css (view source) (protected)
Module:Navbox (view source) (template editor protected)
Module:Navbox/configuration (view source) (template editor protected)
Module:Navbox/styles.css (view source) (template editor protected)
Module:Ns has subpages (view source) (protected)
Module:Official website (view source) (template editor protected)
Module:Pagetype (view source) (protected)
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Module:Pagetype/setindex (view source) (protected)
Module:Pagetype/softredirect (view source) (protected)
Module:Routemap (view source) (template editor protected)
Module:SDcat (view source) (protected)
Module:Side box (view source) (template editor protected)
Module:Side box/styles.css (view source) (template editor protected)
Module:String (view source) (protected)
Module:TableTools (view source) (protected)
Module:Time ago (view source) (template editor protected)
Module:Track gauge (view source) (template editor protected)
Module:Track gauge/data (view source) (template editor protected)
Module:URL (view source) (template editor protected)
Module:Unicode data (view source) (template editor protected)
Module:Unicode data/scripts (view source) (template editor protected)
Module:Unsubst (view source) (protected)
Module:Wikitext Parsing (view source) (protected)
Module:Yesno (view source) (protected)

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