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Metro

Over 4 million people use the London Underground every day. Find out how four key inventions in a series of landmark metro systems helped it become the biggest subway in the Western world.

Deutsch English français русский язык español Magyar dansk
  • Originally Aired July 12, 2011
  • Runtime 45 minutes
  • Content Rating United States of America TV-PG
  • Network National Geographic
  • Created September 17, 2020 by
    Administrator admin
  • Modified June 5, 2022 by
    crimix