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World's busiest metro/subway systems
per Wikipedia:
1. Tokyo Subway (Tokyo Metro and Toei Subway only) 3.161 billion (2010)
2. Moscow Metro 2.348 billion (2010)
3. Seoul Subway (Seoul Metro, SMRT and Seoul Metro Line9 Corporation only) 2.173 billion (2009-2010)
4. Shanghai Metro 1.884 billion (2010)
5. Beijing Subway 1.84 billion (2010)
6. New York City Subway 1.604 billion (2010)
7. Paris Métro 1.506 billion (2010)
8. Mexico City Metro 1.410 billion (2010)
9. Hong Kong Mass Transit Railway 1.41 billion (2010)
10. Guangzhou Metro (including FMetro) 1.18 billion (2010)
11. London Underground 1.107 billion (2010)
12. Osaka Municipal Subway 837 million (FY 2010)
.........more, the complete list is at: http://en.wikipedia.org/wiki/Metro_systems_by_annual_passenger_rides