Queen visits Baker Street station

The Queen arrives at Baker Street for a celebration to mark the Tube's 150th anniversary. Credit: Nick Ansell/PA Wire
It's not the first time the Queen has visited the Tube. In 1977, she opened the extension to Heathrow. Credit: PA Wire

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Underground royal visit

The Queen, the Duke of Edinburgh and the Duchess of Cambridge are visiting Baker Street station to mark the Underground's 150th anniversary.