London

====Suburban====
There are [[List of London railway stations|368 railway stations]] in the [[London fare zones|London Travelcard Zones]] on an extensive above-ground suburban railway network. South London, particularly, has a high concentration of railways as it has fewer Underground lines. Most rail lines terminate around the centre of London, running into [[London station group|eighteen terminal stations]], with the exception of the [[Thameslink (route)|Thameslink]] trains connecting [[Bedford]] in the north and [[Brighton]] in the south via [[London Luton Airport|Luton]] and [[Gatwick Airport|Gatwick]] airports.<ref name="london_127">{{Cite web |url=http://www.firstcapitalconnect.co.uk/Main.php?sEvent=HomePage |archive-url=https://web.archive.org/web/20100130091433/http://www.firstcapitalconnect.co.uk/Main.php?sEvent=HomePage |archive-date=30 January 2010 |title=First Capital Connect |publisher=First Capital Connect |access-date=27 April 2008 |url-status=dead}}</ref> London has Britain's busiest station&nbsp;by number of passengers—[[London Waterloo station|Waterloo]], with over 184&nbsp;million people using the interchange station complex (which includes [[London Waterloo East railway station|Waterloo East]] station) each year.<ref>{{Cite web |url=http://www.rail-reg.gov.uk/server/show/nav.1529 |title=Rail Station Usage |publisher=Office of Rail Regulation |access-date=24 October 2009 |archive-url=https://web.archive.org/web/20070705115621/http://www.rail-reg.gov.uk/server/show/nav.1529 |archive-date=5 July 2007 |url-status=live }}</ref> {{rws|Clapham Junction}} is one of Europe's busiest rail interchanges.<ref>{{cite news |title=Council looks at extension of London Underground's Northern line to Clapham Junction |url=https://www.standard.co.uk/news/london/london-underground-northern-line-clapham-junction-wandsworth-borough-council-b1056869.html |access-date=15 April 2023 |work=Evening Standard}}</ref>

With the need for more rail capacity, the [[Elizabeth line|Elizabeth Line]] (also known as Crossrail) opened in May 2022.<ref>{{Cite news |url=https://www.standard.co.uk/news/london/crossrail-elizabeth-line-opening-date-announced-may-24-london-tube-tfl-transport-for-london-b997837.html |title=Crossrail opening date finally announced  |date=4 May 2022 |access-date=4 May 2022}}</ref> It is a new railway line running east to west through London and into the [[Home Counties]] with a branch to [[Heathrow Airport]].<ref>{{Cite web |year=2021 |title=Regional Map |url=http://www.crossrail.co.uk/route/maps/regional-map |archive-url=https://web.archive.org/web/20101024104105/http://www.crossrail.co.uk/route/maps/regional-map |url-status=dead |archive-date=24 October 2010 |access-date=27 March 2021 |website=[[Crossrail]] }}</ref> It was Europe's biggest construction project, with a £15&nbsp;billion projected cost.<ref>{{Cite news |last=Lister |first=Richard |date=2 January 2012 |title=Crossrail's giant tunnelling machines unveiled |work=[[BBC News]]|url=https://www.bbc.co.uk/news/uk-16289051 |access-date=27 March 2021}}</ref>