German capital’s Berlin Transport Authority (BVG) has announced completion of tunnelling on Berlin U5 line linking Alexanderplatz to Brandenburg Gate. Tunnelling on the on the new €525 million 2.2km U-Bahn link began under the streets of the German capital in 2011, extending the existing U5 line from Alexanderplatz to the Brandenburg Gate and connecting it to line U55.

Transport body BVG has achieved a milestone in the construction of an extension of the Berlin U-Bahn which will connect the U5 and U55 lines.

Berlin U5 line

Berlin’s mayor, Michael Mueller, attended a ceremony to witness the final breakthrough for the ‘U5 gap closure project’ into Brandenburger Tor (Brandenburg Gate) station on March 22.

Two-kilometre long, twin-bore tunnels will connect the U55 line at Brandenburger Tor in Mitte to the U5 at Alexanderplatz.

Line U55, which opened in 2009, links the main line station Berlin Hauptbahnhof with the Bundestag and Brandenburger Tor stations.With work to connect U5 line with U55 already complete, tunnelling began to extend the existing U5 line in April 2015. Implenia, the Swiss construction company, carried out work to build two tunnels using ‘Bärlinde’ the tunnel boring machine. Now, six months later, the 74-metre long, 700-tonne machine has done its duty and drilled out the second tunnel between the U-Bahn stations of Alexanderplatz and Brandenburger Tor. In total ‘Bärlinde’ has created 1620 metres of tunnel and installed 1076 tubbing rings.


Construction of U55 began in the late 1990s. It was originally intended to be an extension of U5, but work was later put on hold and the completed section was opened as a standalone line.

Berlin U5 line tunnel

The new U5 line due for completion in 2020

Completion of the Berlin U5 line project, including construction of new tunnels and new link between the two lines, will create one single line that will run from Hönow to Berlin’s main railway station, Lehrter Bahnhof.

Work will now begin to construct three new underground railway stations, Berliner Rathaus, Museuminsel and Unter den Linden. Work is due for completion in 2019 with the first trains running on the new U5 line in 2020.

Further information on the U5 line project can be found here.


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