Season 3 · Episode 3 of 6
Aired Jul 12, 2011
Metro
Tue, Jul 12, 2011
·
45 min
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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.
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Airs
Tue, Jul 12, 2011
45 min
Show
Big, Bigger, Biggest
20 episodes
Episode
S3 · E3
in Big, Bigger, Biggest