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SLOUGH, UNITED KINGDOM - JUNE 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II arrives at Slough Railway Station to board a Great Western Railway train travelling to London Paddington to mark the 175th anniversary of the first train journey by a British monarch on June 13, 2017 in Slough, England. The Queen and Duke of Edinburgh are recreating the historic journey between Slough and Paddington made by Queen Victoria on June 13, 1842.(Photo by Max Mumby/Indigo/Getty Images)

SLOUGH, UNITED KINGDOM - JUNE 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II arrives at Slough Railway Station to board a Great Western Railway train travelling to London Paddington to mark the 175th anniversary of the first train journey by a British monarch on June 13, 2017 in Slough, England. The Queen and Duke of Edinburgh are recreating the historic journey between Slough and Paddington made by Queen Victoria on June 13, 1842.(Photo by Max Mumby/Indigo/Getty Images)