text: History The North London Railways franchise was awarded to National Express on 7 February 1997. National Express commenced operating the franchise on 3 March 1997.
  After initially trading as North London Railways, in September 1997 the franchise was rebranded as Silverlink.
  The franchise was due to finish on 15 October 2006, but on 11 August 2006 the Department for Transport granted an extension until 10 November 2007. Upon its closure, its London metro services were taken over by London Overground and the remainder were merged with Central Trains' western services to form London Midland.
  Branding
  Silverlink had two sub-brands:
  Silverlink Metro was used for services primarily within Greater London:
  North Woolwich – Richmond (the North London Line)
  Willesden Junction – Clapham Junction (the West London Line)
  London Euston – Watford Junction via Willesden Junction (the Watford DC line)
  Gospel Oak – Barking (the Gospel Oak to Barking Line)
  Silverlink County was used for services beyond Greater London:
  – Northampton (Birmingham New Street until 2004)
  Watford Junction – St Albans Abbey (the St Albans Abbey Line)
  Bletchley – Bedford (the Marston Vale Line)
  Silverlink Metro
  Silverlink Metro operated these services.
  Note: Changes during the franchise period are noted but changes to the lines before and after the franchise are not.
  North London line
  These services ran on the North London line: