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Britain's Kate, the Duchess of Cambridge, reacts as she is presented a badge that says "Baby on Board", normally available to pregnant passengers to encourage others to give them a seat, watched by Britain's Queen Elizabeth II, bottom, 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 after cancellations following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)

Britain's Kate, the Duchess of Cambridge, reacts as she is presented a badge that says "Baby on Board", normally available to pregnant passengers to encourage others to give them a seat, watched by Britain's Queen Elizabeth II, bottom, 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 after cancellations following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)

British royals tour the London Underground

March 21, 2013

The Queen in a public tube station? No, you're not imagining things. Britain's Queen Elizabeth II, along with Catherine, Duchess of Cambridge, paid a royal visit to the Baker Street Underground station in London on Mar. 20 to mark the 150th anniversary of the London Underground.