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Queen Elizabeth II meeting schoolchildren as she and the Duke of Edinburgh arrive at Slough Station to mark the 175th anniversary of the first train journey by a British monarch. (Photo by Andrew Matthews/PA Images via Getty Images)

Queen Elizabeth II meeting schoolchildren as she and the Duke of Edinburgh arrive at Slough Station to mark the 175th anniversary of the first train journey by a British monarch. (Photo by Andrew Matthews/PA Images via Getty Images)

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Queen Elizabeth II and the Duke of Edinburgh arrive at Paddington Station in London, as they marked the 175th anniversary of the first train journey by a British monarch. (Photo by Jonathan Brady/PA Images via Getty Images)

Queen Elizabeth II and the Duke of Edinburgh arrive at Paddington Station in London, as they marked the 175th anniversary of the first train journey by a British monarch. (Photo by Jonathan Brady/PA Images via Getty Images)

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LONDON, ENGLAND - JUNE 13: Queen Elizabeth II and Prince Philip, Duke of Edinburgh arrive at Paddington Station to name a new train 'Queen Elizabeth ll' to mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom. The first journey was made by Queen Victoria on June 13th, 1842. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - JUNE 13:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh arrive at Paddington Station to name a new train 'Queen Elizabeth ll' to mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom.  The first journey was made by Queen Victoria on June 13th, 1842.  (Photo by Karwai Tang/WireImage)

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LONDON, ENGLAND - JUNE 13: Queen Elizabeth II and Prince Philip, Duke of Edinburgh (behind) arrive at Paddington Station as they mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom. The first journey was made on the same route from Slough to Paddington by Queen Victoria on June 13th, 1842. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JUNE 13:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh (behind) arrive at Paddington Station as they mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom.  The first journey was made on the same route from Slough to Paddington by Queen Victoria on June 13th, 1842.  (Photo by Chris Jackson/Getty Images)

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LONDON, ENGLAND - JUNE 13: Queen Elizabeth II arrives at Paddington Station with Prince Philip, Duke of Edinburgh as they mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom. The first journey was made on the same route from Slough to Paddington by Queen Victoria on June 13th, 1842. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JUNE 13:  Queen Elizabeth II arrives at Paddington Station with Prince Philip, Duke of Edinburgh as they mark the 175th anniversary of the first train journey by a British Monarch on June 13, 2017 in London, United Kingdom.  The first journey was made on the same route from Slough to Paddington by Queen Victoria on June 13th, 1842.  (Photo by Chris Jackson/Getty Images)