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Commuters take a bus in central London, ...Commuters take a bus in central London, on February 5, 2014, on the first day of a strike by London Underground workers. Workers on London's Underground train system kicked off a 48-hour strike at 9:00 pm (2100 GMT) on Tuesday, threatening chaos for commuters on Wednesday and Thursday.   AFP PHOTO / BEN STANSALLBEN STANSALL/AFP/Getty Images

Ben Stansall/AFP

Commuters take a bus in central London, on the first day of a strike by London Underground workers. Workers on London’s Underground train system kicked off a 48-hour strike at 9pm on Tuesday. Read more

ames Apps, six, looks at the 2020 Tube map of the future, made entirely from LEGO Bricks, at Londonís King's Cross Station to celebrate 150 years of the London Underground.

Geoff Caddick/PA

A child examines the 2020 Tube map of the future, made entirely from Lego bricks, on display at London’s Kings Cross Station to celebrate 150 years of the London Underground.