Duchess of Cambridge
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Queen unveils train and Duchess given baby badge

20 March 2013 Last updated at 13:03 GMT

The Queen and the Duchess of Cambridge have celebrated the Tube's 150th anniversary at Baker Street station.

The Queen inspected a new S7 train before unveiling a plaque, naming the train Queen Elizabeth II.

Catherine, who is five months pregnant, was given a 'Baby on Board' badge by tube staff.