Britain's Queen Elizabeth speaks with Mike Brown, managing director of London Underground, during her visit to Baker Street underground station in London March 20, 2013.The visit to the station on London's tube transport system, was to mark the 150th anniversary of the London Underground. REUTERS/Chris Radburn/pool (BRITAIN - Tags: ANNIVERSARY ROYALS ENTERTAINMENT SOCIETY TRANSPORT)
Britain's Queen Elizabeth speaks with Mike Brown, managing director of London Underground, during her visit to Baker Street underground station in London March 20, 2013.The visit to the station on London's tube transport system, was to mark the 150th anniversary of the London Underground. REUTERS/Chris Radburn/pool (BRITAIN - Tags: ANNIVERSARY ROYALS ENTERTAINMENT SOCIETY TRANSPORT)