page_title: S4 (Rhine-Ruhr S-Bahn)
section_title: References
hierarchical_section_title: S4 (Rhine-Ruhr S-Bahn) / References
caption_attribution_description: Bahnhof Unna-Königsborn This panoramic image was created with Autostitch. Stitched images may differ from reality.
context_page_description: Line S 4 is an S-Bahn of the Rhine-Ruhr S-Bahn, running from Unna to the Dortmund suburb of Dortmund-Lütgendortmund. It is operated by DB Regio on behalf of Verkehrsverbund Rhein-Ruhr. It is operated at 30-minute intervals using class 422 four-car electrical multiple units.
  Line S 4 runs over several lines:
  from Dortmund-Lütgendortmund to Dortmund-Germania over the new S-Bahn line, opened by Deutsche Bahn on 2 May 1993,
  from Dortmund-Germania to Dortmund Stadthaus over the Rhenish Ruhr line, opened by the Rhenish Railway Company on 19 November 1874,
  the Welver–Sterkrade line opened by the Royal Westphalian Railway Company on 15 May 1876,
  the Fröndenberg–Kamen line opened by the Prussian state railways between 2 January 1899 and 1 November 1900.
  S-Bahn services commenced between old Lütgendortmund station and Unna station on 3 June 1984. The section from Germania to old Lütgendortmund station was closed on 31 August 1987 and operations on the new line to Lütgendortmund commenced on 23 May 1993.
  Extension of the S 4 line from its current western end in the tunnel at Dortmund-Lütgendortmund was formerly planned to be implemented with a target of opening it in 2015.
context_section_description: Eisenbahnatlas Deutschland (German railway atlas). Schweers + Wall. 2009. p. 139. ISBN 978-3-89494-139-0.
  "S4 : Lütgendortmund - Dorstfeld - Unna". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
  "Line 2213: Dortmund-Lütgendortmund ↔ Dortmund-Dorstfeld". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
  "Line 2151: Bochum Präsident - Dortmund Abzw Flm". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
  "Line 2126: Dortmund-Dorstfeld - Dortmund Süd". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
  "Line 2112: Welver - Dortmund Süd". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
  "Line 2852: Fröndenberg - Unna". NRW Rail Archive (in German). André Joost. Retrieved 18 October 2011.
caption: Unna-Königsborn station
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