most extensive metro systems in the world

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Seoul Metropolitan Subway

Most Extensive Metro Systems In The World

Most Extensive Metro Systems In The World
Seoul Metropolitan Subway

Possibly the most heavily used metro system in the world, everyday nearly 8 million people are shuffled among 314 stations on 242 miles of track.

Mass Rapid Transit Singapore
Berlin S Bahn
Hamburg S Bahn
Washington Metro
Paris Metro
Mexico City Metro
Tokyo Metro
Chicago L
Seoul Metropolitan Subway
Madrid Metro
Cairo Egypt
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