Editing Northern line (section)

==Incidents and accidents==
In October 2003, a train derailed at [[Camden Town tube station|Camden Town]].<ref>{{cite news |date=19 October 2003 |title=Second Tube train derailed |publisher=BBC News |url=http://news.bbc.co.uk/2/hi/uk_news/england/london/3204794.stm |access-date=27 May 2020 |archive-date=25 July 2020 |archive-url=https://web.archive.org/web/20200725100727/http://news.bbc.co.uk/2/hi/uk_news/england/london/3204794.stm |url-status=live}}</ref> Although no one was hurt, points, signals and carriages were damaged. Concern was raised about the safety of the Tube, given the derailment at [[Chancery Lane tube station|Chancery Lane]] earlier in 2003.<ref>{{cite news |date=25 January 2003 |title=Thirty hurt after Tube crash |publisher=BBC News |url=http://news.bbc.co.uk/2/hi/uk_news/england/2694361.stm |access-date=27 May 2020 |archive-date=30 April 2020 |archive-url=https://web.archive.org/web/20200430185255/http://news.bbc.co.uk/2/hi/uk_news/england/2694361.stm |url-status=live}}</ref> A joint report by the Underground and its maintenance contractor [[Tube Lines]] concluded that poor [[track geometry]] was the main cause, and therefore extra friction arising out of striations (scratches) on a newly installed set of points had allowed the leading wheel of the last carriage to climb the rail and derail. The track geometry at the derailment site is a very tight bend and tight tunnel bore, which precludes the normal solution for this sort of geometry of canting the track by raising the height of one rail relative to the other.<ref>{{cite magazine |title=Track design flaws may have led to Camden Town Tube derailment |url=https://www.newcivilengineer.com/archive/track-design-flaws-may-have-led-to-camden-town-tube-derailment-04-12-2003/ |date=4 December 2003 |magazine=New Civil Engineer |access-date=27 May 2020}}</ref>

In August 2010, a defective [[Railgrinder|rail grinding]] train caused disruption on the Charing Cross branch, after it travelled four miles in 13 minutes without a driver. The train was being towed to the depot after becoming faulty. At [[Archway tube station|Archway station]], the defective train became detached and ran driverless until coming to a stop at an incline near [[Warren Street tube station|Warren Street station]]. This caused morning rush-hour services to be suspended on this branch. All passenger trains were diverted via the Bank branch, with several not stopping at stations until they were safely on the Bank branch.<ref>{{cite news |date=13 August 2010 |title=Runaway train on London Tube's Northern Line |publisher=BBC News |url=https://www.bbc.co.uk/news/uk-england-10964766 |access-date=18 August 2010 |archive-date=17 August 2010 |archive-url=https://web.archive.org/web/20100817235330/http://www.bbc.co.uk/news/uk-england-10964766 |url-status=live}}</ref><ref>{{cite tech report |title=Runaway of an engineering train from Highgate 13 August 2010 |number=09-2011 |institution=RAIB |year=2011}}</ref>