The Queen, the Duke of Edinburgh and the Duchess of Cambridge visited Baker Street to mark the 150th anniversary of the Underground. They met Tube staff, spoke to Sherlock Holmes and unveiled a plaque on a train.
The Queen, the Duke of Edinburgh and the Duchess of Cambridge are going underground, to celebrate the 150th birthday of the tube.
The Royal party will be greeted at Baker Street by the Commissioner of Transport for London, Sir Peter Hendy, and the Managing Director of London Underground Mike Brown.
They'll meet maintenance and train staff and will view a restored 1892 underground coach. They'll then walk through a new S7 train where the queen will unveil a plaque, naming the train Queen Elizabeth II.
The Queen and Duke of Edinburgh will travel with the Duchess of Cambridge today to Baker Street Underground station in London to mark the transport network's 150th anniversary.
The Queen, who had been suffering symptoms of gastroenteritis, has been carrying out her duties within Buckingham Palace but last week cancelled a trip to London's East End to visit Tech City.
The Duke of York, who carried out the engagement without his mother, said she was "not ill" but stayed at home as precaution.
The last time she was seen at an official event was an engagement last Monday evening when she signed the Commonwealth's new charter.
The Queen, who has been suffering symptoms of gastroenteritis, will carry out her first public engagement in more than a week today when she joins the Duchess of Cambridge at an event celebrating the 150th anniversary of the Tube.