Charles & Camilla on the tube
The Prince of Wales and the Duchess of Cornwall hopped on the tube today to mark the underground's 150th birthday.
Charles and Camilla on the Metropolitan Line
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Steam train returns for 150th anniversary
A steam train which carried passengers in the 19th Century has returned to mark 150 years since the first tube journey.
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Pictures: Stops along the Tube's 150 year journey
A look back at some of the stops on London Underground's 150 year journey.
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150 years of the Tube quiz
All day we've been adding fascinating facts about the Tube, which turns 150 years old this week. Now find out how much you know.