Britain's Queen Elizabeth II steps off a parked train she was shown 

Britain's Queen Elizabeth II steps off a parked train she was shown around at Baker Street underground station in London, for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013.  The Queen made her first public engagement in more than a week Wednesday following her hospitalization for a stomach bug.  The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate Duchess of Cambridge, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube.  (AP Photo/Matt Dunham)
Associated Press
Britain's Queen Elizabeth II steps off a parked train she was shown around at Baker Street underground station in London, for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. The Queen made her first public engagement in more than a week Wednesday following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate Duchess of Cambridge, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)
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