LONDON - MAY 08 :  The 'Underground' sign and 'Big Ben' tower at evening on May 08 2009 in London. The Underground serves 270 stations and has 402 km of track.
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LONDON - MAY 08 : The 'Underground' sign and 'Big Ben' tower at evening on May 08 2009 in London. The Underground serves 270 stations and has 402 km of track.