The Queen will carry out her first public engagement in more than a week on Wednesday when she joins the Duchess of Cambridge at an event celebrating the 150th anniversary of the Tube.
The Queen and Duke of Edinburgh will travel with Kate to Baker Street Underground station in London to mark the transport network's milestone.
Duchess Kate arrived at Baker St Tube station on Wednesday morning
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 Queen's last visit to the underground was in 2010
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 last visited a Tube station in February 2010, when she travelled to Aldgate station to meet staff and view a memorial plaque dedicated to the seven people killed at Aldgate during the July 7, 2005 bombings.
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During the royal party's visit to Baker Street, they will meet station staff in the ticket hall before moving downstairs to the platform where maintenance and train workers will be waiting.
The Queen, Philip and Kate will also view a restored 1892 carriage and meet staff and apprentices involved in the restoration of the rolling stock.
They will then walk through a new S7 train before she unveils a plaque, naming the train Queen Elizabeth II.
The royal party will also meet staff from the Railway Children charity, an international organisation which works to help homeless youngsters.
The Queen and Duchess of Cambridge Visit Baker Street Station
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge and The Duke of Edinburgh, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge and The Duke of Edinburgh, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge, holds a badge that reads Baby on Board, given to her during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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ALTERNATE CROPThe Duchess of Cambridge, holds a badge that reads Baby on Board, given to her during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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The Duchess of Cambridge, arrives by separate car, to join Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, leaves Baker Street underground station in London after a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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The Duchess of Cambridge, arrives by separate car, to join Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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Queen Elizabeth II arrives with Duke of Edinburgh and the Duchess of Cambridge at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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The Duchess of Cambridge, arrives by separate car, to join Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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The Duchess of Cambridge, arrives by separate car, to join Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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Britain's Kate, Duchess of Cambridge, right, accompanies Queen Elizabeth II, unseen, and Prince Philip, left, at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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Britain's Kate, Duchess of Cambridge, right, accompanies Queen Elizabeth II, left, and Prince Philip, center, as they arrive at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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Britain's Kate, Duchess of Cambridge, right, accompanies Queen Elizabeth II and Prince Philip, third left and fourth, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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Britain's Kate, Duchess of Cambridge, right, accompanies Queen Elizabeth II and Prince Philip, obscured at left, as they arrive at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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The Duchess of Cambridge, arrives by separate car, to join Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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LONDON, ENGLAND - MARCH 20: Catherine, Duchess of Cambridge makes an official visit to Baker Street Underground Station on March 20, 2013 in London, England. (Photo by Danny E. Martindale/Getty Images) (credit:Getty Images)
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LONDON, ENGLAND - MARCH 20: Catherine, Duchess of Cambridge makes an official visit to Baker Street Underground Station on March 20, 2013 in London, England. (Photo by Danny E. Martindale/Getty Images) (credit:Getty Images)
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A Baby on Board badge is shown as the Duchess of Cambridge, joined Queen Elizabeth II and the Duke of Edinburgh, at Baker Street Underground station in London for an event celebrating the 150th anniversary of the Tube. (credit:PA)
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Britain's Queen Elizabeth II steps off a parked train she was shown around 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 following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate Duchess of Cambridge, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham) (credit:AP)
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ALTERNATE CROPThe Duchess of Cambridge, holds a badge that reads Baby on Board, given to her during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge arrives at Baker Street Underground Station to Mark 150th anniversary of the London Underground. (credit:PA)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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ALTERNATE CROPThe Duchess of Cambridge arrives at Baker Street Underground Station to Mark 150th anniversary of the London Underground. (credit:PA)
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The Duke of Edinburgh and The Duchess of Cambridge arrive at Baker Street Underground Station to mark the 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge arrives at Baker Street Underground Station to mark the 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge arrives at Baker Street Underground Station to Mark 150th anniversary of the London Underground. (credit:PA)
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Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, leaves Baker Street underground station in London after a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan) (credit:AP)
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The Duchess of Cambridge arrives at Baker Street Underground Station to mark the 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge, holds a badge that reads Baby on Board, given to her during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge arrives at Baker Street Underground Station to Mark 150th anniversary of the London Underground. (credit:PA)
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The Duchess of Cambridge arrives at Baker Street Underground Station to Mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, during a visit to Baker Street Tube Station in London to mark 150th anniversary of the London Underground. (credit:PA)
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Queen Elizabeth II, arrives at Baker Street Underground station in London with the Duchess of Cambridge, for an event celebrating the 150th anniversary of the Tube. (credit:PA)