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Line 37: In a [[subway car]] or [[tram]], an [[insulator (electricity)\|insulator]] at a track switch may cut off power from the car for a few feet along the line and use a large capacitor to store energy to drive the subway car through the insulator in the power feed.<ref>{{Cite web \|url=http://www.facstaff.bucknell.edu/mastascu/elessonshtml/lc/capac1.htm# \|title=Capacitors \|access-date=10 October 2014 \|archive-url=https://web.archive.org/web/20150309023326/http://www.facstaff.bucknell.edu/mastascu/elessonshtml/LC/Capac1.htm# \|archive-date=9 March 2015 \|url-status=dead \|df=dmy-all }}</ref> The new [[Trams in Nanjing\|Nanjing tram]] uses ~~the~~ supercapacitor technology, with charging hardware at each stop instead of continuous catenary. The first line started operating in 2014. The rail vehicles were produced by [[CSR Corporation Limited\|CSR Zhuzhou]]; according to the manufacturers, they are the world's first low-floor tram completely powered by supercapacitors. <ref name=barrow2014>{{cite\|url=http://www.railjournal.com/index.php/light-rail/csr-unveils-100-supercapacitor-powered-tram.html \|date=2014-05-29\|title=CSR unveils 100% supercapacitor-powered tram \|first=Keith\|last=Barrow\|periodical=International Railway Journal}}</ref> Several similar rail vehicles have been ordered for the [[Guangzhou Trams\|Guangzhou Tram]] line as well.<ref name=barrow2014/>

Capacitor electric vehicle: Difference between revisions