"Betriebsstrecken" [Operating distances]. Stadtbahnbauamt (in German). Stadt Dortmund. Archived from the original on 2012-03-14. Retrieved 20 February 2017.
urbanrail.net
Robert Schwandl. "Dortmund". Urban Rail. Retrieved 18 June 2020.
web.archive.org
"Betriebsstrecken" [Operating distances]. Stadtbahnbauamt (in German). Stadt Dortmund. Archived from the original on 2012-03-14. Retrieved 20 February 2017.