Metropolitan 1, a restored steam train built in 1898, passes through Farringdon Tube station on it's journey between Olympia Tube station in the west to Moorgate station in the City of London, Sunday, Jan. 13, 2013, as part of the celebrations for the 150th anniversary of the London Underground Tube system. The first stretch of the world-famous network opened to the public on Jan. 10, 1863. (AP Photo/Alastair Grant)

Associated Press
Metropolitan 1, a restored steam train built in 1898, passes through Farringdon Tube station on it's journey between Olympia Tube station in the west to Moorgate station in the City of London, Sunday, Jan. 13, 2013, as part of the celebrations for the 150th anniversary of the London Underground Tube system. The first stretch of the world-famous network opened to the public on Jan. 10, 1863. (AP Photo/Alastair Grant)
Metropolitan 1, a restored steam train built in 1898, passes through Farringdon Tube station on it's journey between Olympia Tube station in the west to Moorgate station in the City of London, Sunday, Jan. 13, 2013, as part of the celebrations for the 150th anniversary of the London Underground Tube system. The first stretch of the world-famous network opened to the public on Jan. 10, 1863. (AP Photo/Alastair Grant)
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