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
2. Moscow Metro
Passenger rides per year: 2.348 billion (2010)
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World's busiest metro rail stations
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
4. Shanghai Metro
Passenger rides per year: 1.884 billion (2010)
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World's busiest metro rail stations
5. Beijing Subway
Passenger rides per year: 1.869 billion (2011)
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World's busiest metro rail stations
6. Guangzhou Metro
(including FMetro)
Passenger rides per year: 1.64 billion (2011)
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World's busiest metro rail stations
7. New York City Subway
Passenger rides per year: 1.604 billion (2010)
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World's busiest metro rail stations
8. Paris Metro
Passenger rides per year: 1.506 billion (2010)
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World's busiest metro rail stations
9. Mexico City Metro
Passenger rides per year: 1.410 billion (2010)
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World's busiest metro rail stations
10. Hong Kong Mass Transit Railway
Passenger rides per year: 1.366 billion (2011)
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World's busiest metro rail stations
11. London Underground
Passenger rides per year: 1.107 billion (2010)
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World's busiest metro rail stations
12. Osaka Municipal Subway
Passenger rides per year: 837 million (FY 2010)
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World's busiest metro rail stations
13. Cairo Metro
Passenger rides per year: 805 million (2009/2010)
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World's busiest metro rail stations
14. Saint Petersburg Metro
Passenger rides per year: 777.3 million (2010)
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World's busiest metro rail stations
15. Sao Paulo Metro
Passenger rides per year: 754 million (2010)
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World's busiest metro rail stations
16. Singapore Mass Rapid Transit
Passenger rides per year: 744.8 million (2010)
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World's busiest metro rail stations
17. Madrid Metro
Passenger rides per year: 642 million (2009)
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World's busiest metro rail stations
18. Santiago Metro
Passenger rides per year: 621 million (2010)
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World's busiest metro rail stations
19. Prague Metro
Passenger rides per year: 578.5 million (2010)
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World's busiest metro rail stations
20. Taipei Metro
Passenger rides per year: 566.4 million (2011)
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World's busiest metro rail stations
21. Vienna U-Bahn
Passenger rides per year: 534.4 million (2010)
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World's busiest metro rail stations
22. Berlin U-Bahn
Passenger rides per year: 508.9 million (2009)
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World's busiest metro rail stations
23. Kiev Metro
Passenger rides per year: 504.3 million (2010)
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World's busiest metro rail stations
24. Delhi Metro
Passenger rides per year: 459.5 million (2010-2011)
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World's busiest metro rail stations
25. Caracas Metro
Passenger rides per year: 484.6 million (2009)
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