title: S7 (Berlin)
text: # S7 (Berlin)
  
  S7 is a line on the Berlin S-Bahn. It operates from Ahrensfelde to Potsdam over:
  
  * the Wriezen Railway, completed on 1 May 1898 and electrified to Marzahn in 1976, to Mehrower Allee in 1980 and to Ahrensfelde in 1982,
  * a section of the Outer ring, completed in the early 1940s as part of the Outer freight ring and electrified in 1976,
  * a section of the Prussian Eastern line, opened on 1 October 1866 and electrified on 6 November 1928,
  * the Stadtbahn, opened on 7 February 1882 and electrified on 11 June 1928,
  * a section of the Berlin-Blankenheim line, opened west of Grunewald in 1879 and further east in 1882 and electrified in 1928 and
  * a section of the Berlin-Potsdam-Magdeburg line, opened in 1838 and electrified in 1928.
  
  ## Service history
  
  The S7 was created on 2 June 1991, replacing the Red route of the East Berlin S-Bahn between Alexanderplatz and Ahrensfelde, with the western terminus extended to Friedrichstraße.
  
  ## Gallery
  
  * S7 leaving Berlin Hauptbahnhof en route for Ahrensfelde
  