December 2009.A Circle line service arrives at London Underground's Liverpool Street station.

July 2009.Passengers prepare to board a Northern line service at Euston station.

July 2009.A Northern line service arrives at Clapham Common station.

July 2009.A Circle line service arrives at King's Cross and St Pancras station.

July 2009.Passengers prepare to board a Northern line service at Euston station.

July 2009.A Northern line service arrives at Clapham Common station.

July 2009.A Bakerloo line service arrives at Paddington.

May 2009.A Bakerloo service departs from Willesden Junction station.

May 2009.A Bakerloo service,for Stonebridge Park,calls at Queens Park station.

May 2009.A Bakerloo line service arrives at London Underground's Oxford Circus station.

May 2009.A Victoria line service arrives at London Underground's Euston station.

May 2009.A Victoria line service arrives at London Underground's Euston station.

May 2009.A Northern line service arrives at London Underground's Green Park station.

April 2009.A Victoria line service arrives at London Underground's Victoria station.

March 2009.Viewed from a First Capital Connect service,passengers prepare to board a Metropolitan service at Barbican station.

March 2009.Circle and Metropolitan line trains pass at Moorgate.

March 2009.A Circle line service calls at Moorgate station.

March 2009.A Metropolitan train calls at Moorgate station.

March 2009.Passengers prepare to board a London Underground Northern line service at Clapham Common.

March 2009.Northern line trains pass at Clapham Common station.

March 2009.A Circle line train arrives at London Underground's Notting Hill station.

January 2009.A Northern line train arrives at London Underground's Euston station.

January 2009.A Northern line service arrives at London Underground's Charing Cross station.

January 2009.Passengers prepare to board a Northern line service at London Underground's Charing Cross station.