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TWEEDBANK, ENGLAND - SEPTEMBER 9: Queen Elizabeth II travels on a steam train to inaugurate the new £294 million Scottish Borders Railway, on the day the Queen becomes Britain's longest reigning monarch, on September 9, 2015 in Tweedbank, England. (Photo by Andrew Milligan - WPA Pool/Getty Images)

TWEEDBANK, ENGLAND - SEPTEMBER 9: Queen Elizabeth II travels on a steam train to inaugurate the new £294 million Scottish Borders Railway, on the day the Queen becomes Britain's longest reigning monarch, on September 9, 2015 in Tweedbank, England. (Photo by Andrew Milligan - WPA Pool/Getty Images)