page_title: U2 (Berlin U-Bahn)
section_title: History
hierarchical_section_title: U2 (Berlin U-Bahn) / History
context_page_description: U2 is a line of the Berlin U-Bahn. The U2 line starts at Pankow S-Bahn station, runs through the eastern city centre to Potsdamer Platz, the western city centre and finally to the Ruhleben terminal station.
  The U2 has 29 stations and a length of 20.7 kilometers. Together with the U1, U3, and U4 lines, it was part of the early Berlin U-Bahn network built before 1914. The line between Potsdamer Platz and Zoologischer Garten was the western section of the "stem line", Berlin's first U-Bahn line opened in 1902.
context_section_description: The increasing traffic problems in Berlin at the end of the 19th century led to a search for new efficient means of transport. Inspired by Werner von Siemens, numerous suggestions were made for overhead conveyors, such as a suspension railway, as was later built in Wuppertal, or a tube railway as was built in London.  Finally Siemens and some prominent Berliners submitted a plan for an elevated railway on the model of New York.  These people opposed Siemens' suggestion of building an overhead railway in the major street of Friedrichstraße, but the city of Berlin opposed underground railways, since it feared damage to one of its new sewers.  
  Finally, after many years and negotiations, Siemens proposal for an elevated railway line from Warschauer Brücke via Hallesches Tor to Bülowstraße was approved.  This was only possible, however, because it passed through poor areas.  The richer residents of Leipziger Straße pressed the city administration to prevent the line using their street.  Siemens & Halske carried out all construction work and also owned the line.  The first sod was turned on 10 September 1896 in Gitschiner Straße.  The construction work had to be carried out quickly because the contract with the city of Berlin, signed with the granting of the concession, specified that the line had to be finished within two years, or a penalty of 50,000 marks would be payable.
  The railway engineers developed a design for the supporting columns for the elevated railway, but it was unpopular and the architect Alfred Grenander was asked to submit an artistic solution for this problem.  For the next 30 years Grenander was the house architect for the elevated and underground railway.
  After tough negotiations with the city of Charlottenburg it was decided to extend the line to Knie along the Tauentzienstraße, but instead of being elevated it would be a subsurface (cut-and-cover) railway.  The management of the city of Berlin board of works regarded the idea of an underground railway sympathetically.  Since the underground caused no apparent damage to the new sewer, an underground branch could be built from a junction at Gleisdreieck (German for "rail triangle") to Potsdamer Platz, Berlin’s then city centre. The national government granted permission for the planning changes on 1 November 1900.
  The total length of the elevated and underground railway was now 10.1 km (6.3 mi).  The largest part of the route, approximately 8 km (5.0 mi), would be established on viaducts and connect eleven elevated stations.  In addition there would be 2 km (1.2 mi) of underground line with three underground stations. The planners believed that 8-carriage trains would not be needed and therefore designed it with 80 m-long platforms, sufficient only for 6-carriage trains.
  The first 6 km (3.7 mi) of the line was finished in 1901 and on 15 February 1902 the first train ran on the line from Potsdamer Platz to Zoologischer Garten, then to Stralauer Tor and back to Potsdamer Platz. This allowed many prominent Berliners to participate in the opening trip, including the Prussian minister for public works, Karl von Thielen.  On 18 February 1902 the first stage of the Berlin U-Bahn was officially opened (Stralauer Tor–Potsdamer Platz). In March the line was extended to Zoologischer Garten and on 17 August it was extended by 380 m from Stralauer Tor to Warschauer Brücke. There were at that time only two lines: 
  From Warschauer Brücke to Zoologischer Garten via Potsdamer Platz (with reversal).
  From Warschauer Brücke directly to Zoologischer Garten.
  On 14 December the line was extended to Knie.  The section between Gleisdreieck and Knie (now Ernst-Reuter-Platz) is now part of U2.
caption: The original route
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