Editing High Speed 1 (section)

=== Track ===
Both track and signalling technology ([[Transmission voie-machine|TVM-430]] + [[Contrôle de vitesse par balises|KVB]]) are based on or identical to the standards used on the French [[Lignes à Grande Vitesse|LGV]] high-speed lines. The areas around St Pancras and Gare du Nord use colour light and KVB signalling<ref>{{cite web|url=http://www.rgsonline.co.uk/Deviations/Derogation/07-099-DGN.pdf |title=07 099 DGN certificate |format=Certificate of Derogation from a Railway Group Standard |publisher=Rail Safety and Standards Board |page=2 |date=24 August 2007 |access-date=13 February 2012 |quote=The new CTRL St Pancras terminal station and approaches is fitted with colour light signalling. In addition, the continuous supervision KVB Automatic Train Protection (ATP) system is installed to comply with CTRL requirements for full ATP. |url-status=dead |archive-url=https://web.archive.org/web/20131002123655/http://www.rgsonline.co.uk/Deviations/Derogation/07-099-DGN.pdf |archive-date=2 October 2013 |df=dmy-all }}</ref> with the whole of the high-speed route to Paris (CTRL, Channel Tunnel, LGV Nord) using TVM-430. Traffic between London and the Channel Tunnel is controlled from the Ashford signalling centre. Signalling tests before opening were performed by the [[SNCF]]-owned "Lucie" test car.<ref>{{cite news|quote=Certification of the TVM430 signalling system on the CTRL almost caused a delay in opening of section 1 in 2003.|title=Britain finally joins the high-speed club: the first section of CTRL opens on 28 September|work=[[International Railway Journal]]|date=August 2003}}</ref>

The track is {{RailGauge|sg|allk=on}}<ref name="network-statement-2009" /> cleared to a larger modern European GC [[loading gauge]]<ref name="network-statement-2009">{{cite web|url=http://www.highspeed1.com/resources/documents/HS1%20Network%20Statement.pdf|title=HS1 Network Statement|date=17 August 2009|publisher=HS1 Limited|pages=17, 19|quote=3.3.1.2 Track Gauge & Structure Gauge: The nominal track gauge is 1435&nbsp;mm. ... 3.3.2.1 Loading Gauge: … UIC "GC" on HS1; and UIC "GB+" on Ashford connecting lines … Waterloo connection .. structure gauge (W6/W6A)|url-status=dead|archive-url=https://web.archive.org/web/20140414094508/http://www.highspeed1.com/resources/documents/HS1%20Network%20Statement.pdf|archive-date=14 April 2014|df=dmy-all}}</ref> enabling GC gauge freight as far as the yards at [[Barking, London|Barking]].<ref name=DfTlong>{{cite web|url=http://www.dft.gov.uk/pgr/rail/strategyfinance/strategy/freightnetwork/strategicfreightnetwork.pdf |title=Strategic Freight Network: The Longer-Term Vision |publisher=Department for Transport |access-date=17 May 2009 |page=15 |quote=20.5 European freight link (UIC GB+ Gauge): A European loading gauge freight link has been secured as far as Barking through Channel Tunnel |url-status=dead |archive-url=https://web.archive.org/web/20110304080044/http://www.dft.gov.uk/pgr/rail/strategyfinance/strategy/freightnetwork/strategicfreightnetwork.pdf |archive-date=4 March 2011 |df=dmy-all }}</ref><ref>{{cite news|url=http://www.railway-technology.com/features/feature1345/|title=Eurostar Revamps High-Speed Service|newspaper=Railway Technology |date=15 October 2007|access-date=11 February 2010|archive-date=28 January 2010|archive-url=https://web.archive.org/web/20100128022405/http://www.railway-technology.com/features/feature1345/|url-status=live |author1=Cmsadmin }}</ref> The line is electrified entirely using [[overhead lines]] with [[25 kV AC railway electrification]].[[File:Class373-eurostar-north-downs-tunnel-high-speed-1-telephoto.jpg|thumb|right|[[North Downs Tunnel]], northern portal under [[Blue Bell Hill]]]]