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4. satır:
== Dış bağlantılar ==
{{Commons kategori|Third rail}}
* [http://patimg1.uspto.gov/.piw?Docid=00263132&PageNum=2&idkey=NONE Thomas Edison's third rail patent (1882)]{{Webarşiv|url=https://web.archive.org/web/20170728194924/http://patimg1.uspto.gov/.piw?Docid=00263132&PageNum=2&idkey=NONE
* [http://trb.org/publications/circulars/ec058/15_02_Swanson.pdf Lightrail without wires]{{Webarşiv|url=https://web.archive.org/web/20060306132546/http://trb.org/publications/circulars/ec058/15_02_Swanson.pdf
* [http://clag.org.uk/3rd-4th.html Details]{{Webarşiv|url=https://web.archive.org/web/20170715050424/http://www.clag.org.uk/3rd-4th.html
* [http://sonic.net/~mly/Caltrain-Electrification/1992-report-400dpi/e75-095.html Morrison-Knudsen 1992]{{Webarşiv|url=https://web.archive.org/web/20160414160733/http://sonic.net/~mly/Caltrain-Electrification/1992-report-400dpi/e75-095.html
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