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UNITED KINGDOM - SEPTEMBER 20: Princess Elizabeth, together with her pet corgi, board the Royal Train at Kings Cross. It is likely that this journey was made to Edinburgh on 28 February to 4 March 1949, and that the Duke of Edinburgh accompanied his wife. (Photo by SSPL/Getty Images)

UNITED KINGDOM - SEPTEMBER 20:  Princess Elizabeth, together with her pet corgi, board the Royal Train at Kings Cross. It is likely that this journey was made to Edinburgh on 28 February to 4 March 1949, and that the Duke of Edinburgh accompanied his wife.  (Photo by SSPL/Getty Images)