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"Berlin Subway • Trackmap"(PDF). Gleisplanweb.de (in German and English). Kranenburg: Christian Stade. 11 December 2022. Archived from the original(PDF) on 7 April 2023. Retrieved 11 June 2023.
"Einsatz Fahrzeugtypen U-Bahn". Berliner Linienchronik (in German). Berlin: Fabian Sawall. 1 November 2017. Archived from the original(PDF) on 30 November 2017. Retrieved 11 June 2023.
"U-Bahnlinie U55". Berliner Verkehrsbetriebe (in German). Berlin: Berliner Verkehrsbetriebe. 8 August 2009. Archived from the original on 12 October 2009. Retrieved 12 June 2023.
"Berlin Subway • Trackmap"(PDF). Gleisplanweb.de (in German and English). Kranenburg: Christian Stade. 11 December 2022. Archived from the original(PDF) on 7 April 2023. Retrieved 11 June 2023.