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Ground-level power supply
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===CAF ACR=== [[File:Tram in Luxemburg stad in 2021 3.jpg|thumb|CAF ACR tram, [[Luxemburg]], 2021. The tram is powered between stations by [[supercapacitor]]s charged from the two metal strips between the rails at station stops.]] [[Construcciones y Auxiliar de Ferrocarriles]] (CAF) trialed its [[Acumulador de Carga Rápida]] (ACR) system in 2007 in [[Seville]]. The system is capable of charging from strips on the ground or from overhead wires. Sections of the [[MetroCentro (Seville)|Seville MetroCentro tramway]] around the [[Seville Cathedral]] were converted to the ACR ground-level power supply system. ACR's first commercial installation was aboard Urbos trams supplied to MetroCentro in 2011, allowing the permanent removal of overhead lines around the cathedral.<ref>{{Cite news|url=https://www.diariodesevilla.es/sevilla/Adios-catenarias-Catedral_0_466453411.html|title=Adiós a las catenarias en la Catedral|last=Ameneiro|first=A. S.|date=2011-04-05|work=Diario de Sevilla|access-date=July 16, 2018|location=Seville|language=es}}</ref> Line 1 of the [[Zaragoza tram|Tranvía de Zaragoza]] has also used ACR since its second construction phase was completed in 2013. The use of ACR avoided the installation of overhead lines in the city's historic centre.<ref>{{Cite news|url=http://www.railwaygazette.com/news/single-view/view/zaragoza-tram-enters-service.html|title=Zaragoza tram Line 1 enters service|date=2011-04-26|work=[[Railway Gazette International]]|access-date=2018-07-16|location=London|language=en}}</ref><ref>{{Cite news|url=http://www.aragondigital.es/noticia.asp?notid=55486&secid=4|title=CAF apuesta por que Zaragoza tenga un metro sin catenarias que funcione con la energía que recargue en las paradas|last=Crespo Roig|first=María|date=2011-01-20|work=aragondigital.es|access-date=July 16, 2018|location=Zaragoza|language=es}}</ref> ACR was included in the [[Newcastle Light Rail]] in Australia and [[Trams in Luxembourg|Luxembourg's new tram system]].<ref>{{Cite web|url=https://www.railexpress.com.au/newcastle-light-rail-to-be-australias-first-wire-free-system/|title = Newcastle light rail to be Australia's first 'wire-free' system|date = 19 April 2017}}</ref><ref>{{Cite web|url=https://www.aurecongroup.com/projects/transport/newcastle-light-rail|title = Newcastle Light Rail, Australia | Aurecon}}</ref>
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