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LONDON, UNITED KINGDOM - JULY 08: Commuters queuing for tube trains at Green Park Tube Station ahead of the tube strike in evening rush hour of July 8, 2015 in London, England. The strike will be a 27-hour stoppage by about 20,000 Tube staff to shut down the entire London Underground network. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)

LONDON, UNITED KINGDOM - JULY 08: Commuters queuing for tube trains at Green Park Tube Station ahead of the tube strike in evening rush hour of July 8, 2015 in London, England. The strike will be a 27-hour stoppage by about 20,000 Tube staff to shut down the entire London Underground network. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)