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Open Image Modal15th May 1939: Princess Elizabeth and Princess Margaret (1930 - 2002) with Lady Helen Graham and Miss Marion Crawford ('Crawfie'- Princess Elizabeth's governess) after their first ride on the Underground.. (Photo by Central Press/Getty Images) (credit:Central Press via Getty Images)
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Open Image Modal7th March 1969: Queen Elizabeth II descends the steps at Green Park underground station for the official opening ceremony of London Underground's Victoria Line. (Photo by Evening Standard/Getty Images) (credit:Evening Standard via Getty Images)
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Open Image ModalQueen Elizabeth II travels on a tube train after the official opening ceremony of London Underground's Victoria Line, 7th March 1969. (Photo by Fox Photos/Hulton Archive/Getty Images) (credit:Fox Photos via Getty Images)
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Open Image ModalQueen Elizabeth II opens the new Victoria Line on the London Underground, 7th March 1969. Here she travels on the tube like an ordinary commuter. (Photo by Keystone/Getty Images) (credit:Keystone via Getty Images)
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Open Image ModalQueen Elizabeth II opens the new Victoria Line on the London Underground, 7th March 1969. Here she travels down the escalator at Green Park Station, past a poster for Alan Bennett's '40 Years On' and an advertisement for Quickies make-up remover. (Photo by Keystone/Getty Images) (credit:Keystone via Getty Images)
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Open Image ModalQueen Elizabeth II opens the new Victoria Line on the London Underground, 7th March 1969. Here she enters the underground at Green Park Station. (Photo by Mike Lawn/Fox Photos/Getty Images) (credit:Mike Lawn via Getty Images)
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Open Image ModalQueen Elizabeth II opens the new Victoria Line on the London Underground, 7th March 1969. Here she walks along the platform at Oxford Circus. (Photo by Evening Standard/Hulton Archive/Getty Images) (credit:Evening Standard via Getty Images)
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Open Image ModalBritain's Queen Elizabeth II inaugurates on March 7, 1969 the Victoria line of the London Underground during the official opening ceremony. AFP PHOTO (Photo credit should read STRINGER/AFP/Getty Images) (credit:STRINGER via Getty Images)
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Open Image ModalBritain's Queen Elizabeth II is presented with a tube station sign for Buckingham Palace during a visit to Aldgate Underground station in London, on February 24, 2010. Britain's Queen Elizabeth II was on Wednesday presented with specially commissioned 'Buckingham Palace' version of the famous logo on a tour of Aldgate station during her day in the City of London. AFP PHOTO/Jeremy Selwyn/POOL (Photo credit should read JEREMY SELWYN/AFP/Getty Images) (credit:AFP via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II leaving after an official visit to Baker Street Underground Station on March 20, 2013 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images) (credit:Mark Cuthbert via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II stands onboard a train as she makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II stands onboard a train as she makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II inspects a vintage train as she makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalLONDON, ENGLAND - MARCH 20: Queen Elizabeth II stands onboard a train as she makes an official visit to Baker Street Underground Station, to mark 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Open Image ModalQueen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:Chris Radburn/PA Archive)