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LONDON, UNITED KINGDOM - FEBRUARY 23: Queen Elizabeth visits the new Crossrail Bond street station which is still under construction on February 23, 2016 in London, England. The Queen unveiled the new roundel for the Crossrail line that is to be renamed the "Elizabeth line" from December 2018 when the line opens to passengers in the capital. (Photo by Richard Pohle - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - FEBRUARY 23: Queen Elizabeth visits the new Crossrail Bond street station which is still under construction on February 23, 2016 in London, England. The Queen unveiled the new roundel for the Crossrail line that is to be renamed the "Elizabeth line" from December 2018 when the line opens to passengers in the capital. (Photo by Richard Pohle - WPA Pool/Getty Images)