Britain's Prince Charles, and Camilla, Duchess of Cornwall, walk through a ticket 

Britain's Prince Charles, and Camilla, Duchess of Cornwall, walk through a ticket barrier as they prepare to travel on a London underground train as they mark 150 years of London Underground, Wednesday Jan. 30, 2013.  (AP Photo/Chris Jackson, Pool)
Associated Press
Britain's Prince Charles, and Camilla, Duchess of Cornwall, walk through a ticket barrier as they prepare to travel on a London underground train as they mark 150 years of London Underground, Wednesday Jan. 30, 2013. (AP Photo/Chris Jackson, Pool)
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