LONDON, ENGLAND - JUNE 13:   Prince Philip, Duke of Edinburgh travels by train from Slough to Paddington with Queen Elizabeth II 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 Paul Edwards - WPA Pool/Getty Images)