Route
The U4 is the newest line of the Hamburg U-Bahn and the first line that is to form as a branch of an older, existing line. It shares the U2's tracks from Billstedt (Hamburg U-Bahn station), Billstedt to the major transfer station Jungfernstieg station, Jungfernstieg, located in the city center, branching off before the station and stopping at the outer tracks of the four-platform station. It then traverses under the Neustadt, Hamburg, Neustadt in a far-swinging 180° bend and reaches the newly built Überseequartier (Hamburg U-Bahn station), Überseequartier station in HafenCity after about . The following station, HafenCity Universität (Hamburg U-Bahn station), HafenCity Universität lies about to the east in the Elbtorquartier. On 7 December 2018 the line was extended eastward, to a new terminus at Elbbrücken station, Elbbrücken, allowing for a future Hamburg S-Bahn, S-Bahn connection with lines S3/S31. The line runs almost entirely underground, only surfacing at Elbbrücken station, Elbbrücken and Billstedt (Hamburg U-Bahn station), Billstedt at both ends. There is also a short uncovered section east of Burgstraße (Hamburg U-Bahn station), Burgstraße.Projected extensions
Elbbrücken
In January 2013, the government of Hamburg decided to build the U4 one more station to Elbbrücken. At Elbbrücken, the U4 will have connections to the Hamburg S-Bahn. In April 2015, the construction works for the extension of the U4 started.Eastern extension from Horner Rennbahn to Dannerallee
At Horner Rennbahn, the U4 is planned to branch off of the U2 and continue east under the Manshardtstraße. Two new stations are planned along this extension: Stoltenstraße, east of the existing bus stop with the same name, and Dannerallee, west of the bus station with the same name in the area of a local shopping center. Following the two stations, the construction of a two-track storage facility is also planned, which is to be built in such a way as to allow a later extension of the line towards Jenfeld. Overall, the extension to Dannerallee is expected to connect the households of around 13,000 people to the metro network. By 2030 the Hochbahn expects 13,600 daily passengers on the line.Gallery
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