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Track renewal, the ongoing modernisation of the railway network by replacing track and signalling, continues to be carried out by private engineering firms under contract. The biggest renewals projects include the multibillion-pound upgrade of the London – Glasgow [[West Coast Main Line]], which was completed in 2008, the [[Thameslink Programme]] to upgrade the north–south railway through London and work on the part of [[Crossrail]] which is operated by Network Rail.<ref>{{cite web |url= https://www.networkrail.co.uk/improvements/indexpage.aspx |title=Our plan for rail in Britain |url-status=live |archive-url= https://web.archive.org/web/20161026210441/http://www.networkrail.co.uk/improvements/indexpage.aspx |archive-date=26 October 2016 |df=dmy-all}}</ref> A line closure for engineering or renewal works is known as a possession.
Network Rail has an internal infrastructure database known as
In 2006, Network Rail made public a high-tech plan to combat the effects of [[slippery rail]]. This plan involves the use of satellites for tracking trouble areas, water-jetting trains and crews using railhead scrubbers, sand sticks and a substance called Natrusolve, which dissolves leaf mulch.<ref>{{cite news |url= http://www.yorkpress.co.uk/news/1032195.leaves_on_line_cause_rail_delays/ |title=Leaves on line cause rail delays |newspaper=[[The Press (York)|The Press]] |place=York |publisher=[[Newsquest]] |first=Gavin |last=Aitchison |date=21 November 2006 |url-status=live |archive-url= https://web.archive.org/web/20160306031240/http://www.yorkpress.co.uk/news/1032195.leaves_on_line_cause_rail_delays/ |archive-date= 6 March 2016 |df=dmy-all}}</ref>
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