Editing Channel Tunnel (section)

==== Power supply ====
Power is delivered to the locomotives via an [[overhead line]] at [[25 kV AC railway electrification|{{nowrap|25 kV 50 Hz}}]]<ref name="Kirkland pp.134–148">Kirkland pp. 134–148</ref><ref name="wiki_railelectric">Article: Railway electric traction 9 August 2009</ref> with a normal overhead clearance of {{cvt|6.03|m|ftin|frac=2}}.<ref>{{cite web |url= https://www.getlinkgroup.com/content/uploads/2019/09/Eurotunnel-network-statement-2020.pdf#page=12 |title= Eurotunnel Fixed Link Usage Annual Statement – 2020 Working Timetable – |year= 2018 |page= 12 |access-date= 3 May 2021 |archive-url= https://web.archive.org/web/20210504060210/https://www.getlinkgroup.com/content/uploads/2019/09/Eurotunnel-network-statement-2020.pdf#page=12 |archive-date= 4 May 2021 |url-status= dead }}</ref> All tunnel services run on electricity, shared equally from English and French sources. There are two substations fed at 400 kV at each terminal, but in an emergency, the tunnel's lighting (about 20,000 light fittings) and the plant can be powered solely from either England or France.{{sfn|Foreign & Commonwealth Office|1994|p=9}}

The traditional railway south of London uses a 750&nbsp;V&nbsp;DC [[third rail]] to deliver electricity, but since the opening of [[High Speed 1]] there is no longer any need for tunnel trains to use it. High Speed 1, the tunnel and the [[LGV Nord]] all have power provided via overhead catenary at 25&nbsp;kV&nbsp;50&nbsp;Hz AC. The railways on "classic" lines in Belgium are also electrified by overhead wires, but at 3,000&nbsp;V&nbsp;DC.<ref name="wiki_railelectric"/>