There are around 160 metro systems in the world. The first metro system, the London Underground, was opened in 1863.
While Shanghai Metro is the longest system in passenger route length, the Tokyo Subway is the world's busiest in terms of passenger rides per year.
1. Tokyo Subway
(Tokyo Metro and Toei Subway only)
Passenger rides per year: 3.161 billion (2010)
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World's busiest metro rail stations
Image: Moscow Metro.2. Moscow Metro
Passenger rides per year: 2.348 billion (2010)
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World's busiest metro rail stations
Image: Seoul Subway.Seoul Subway
(Seoul Metro, SMRT and Seoul Subway Line 9 only)
Passenger rides per year: 2.173 billion (2009-2010)
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World's busiest metro rail stations
Image: Shanghai Metro.4. Shanghai Metro
Passenger rides per year: 1.884 billion (2010)
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World's busiest metro rail stations
Image: Beijing Subway.5. Beijing Subway
Passenger rides per year: 1.869 billion (2011)
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World's busiest metro rail stations
Image: Guangzhou Metro. 6. Guangzhou Metro
(including FMetro)
Passenger rides per year: 1.64 billion (2011)
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World's busiest metro rail stations
Image: New York City Subway.7. New York City Subway
Passenger rides per year: 1.604 billion (2010)
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World's busiest metro rail stations
Image: Paris Metro.8. Paris Metro
Passenger rides per year: 1.506 billion (2010)
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World's busiest metro rail stations
Image: Mexico City Metro.9. Mexico City Metro
Passenger rides per year: 1.410 billion (2010)
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World's busiest metro rail stations
Image: Hong Kong Mass Transit Railway.10. Hong Kong Mass Transit Railway
Passenger rides per year: 1.366 billion (2011)
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World's busiest metro rail stations
Image: London Underground.11. London Underground
Passenger rides per year: 1.107 billion (2010)
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World's busiest metro rail stations
Image: Osaka Municipal Subway.12. Osaka Municipal Subway
Passenger rides per year: 837 million (FY 2010)
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World's busiest metro rail stations
Image: Cairo Metro.13. Cairo Metro
Passenger rides per year: 805 million (2009/2010)
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World's busiest metro rail stations
Image: Saint Petersburg Metro.14. Saint Petersburg Metro
Passenger rides per year: 777.3 million (2010)
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World's busiest metro rail stations
Image: Sao Paulo Metro.15. Sao Paulo Metro
Passenger rides per year: 754 million (2010)
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World's busiest metro rail stations
Image: Singapore Mass Rapid Transit.16. Singapore Mass Rapid Transit
Passenger rides per year: 744.8 million (2010)
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World's busiest metro rail stations
Image: Madrid Metro.17. Madrid Metro
Passenger rides per year: 642 million (2009)
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World's busiest metro rail stations
Image: Santiago Metro.18. Santiago Metro
Passenger rides per year: 621 million (2010)
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World's busiest metro rail stations
Image: Prague Metro.19. Prague Metro
Passenger rides per year: 578.5 million (2010)
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World's busiest metro rail stations
Image: Taipei Metro.20. Taipei Metro
Passenger rides per year: 566.4 million (2011)
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World's busiest metro rail stations
Image: Vienna U-Bahn.21. Vienna U-Bahn
Passenger rides per year: 534.4 million (2010)
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World's busiest metro rail stations
Image: Berlin U-Bahn.22. Berlin U-Bahn
Passenger rides per year: 508.9 million (2009)
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World's busiest metro rail stations
Image: Kiev Metro.23. Kiev Metro
Passenger rides per year: 504.3 million (2010)
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World's busiest metro rail stations
Image: Delhi Metro.24. Delhi Metro
Passenger rides per year: 459.5 million (2010-2011)
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World's busiest metro rail stations
Image: Caracas Metro.25. Caracas Metro
Passenger rides per year: 484.6 million (2009)
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