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Morning commuters crowd onto escalators in the People's Square subway station in Shanghai, China on 25 February 2009.  Shanghai's subway system, with a total annual passenger flow of over 700 million, is the world's 10th largest transportation network in traffic. The city is also quickly expanding it's subway system, to accommodate a swelling population of over 23 million residents according to the latest census in 2010.
Morning commuters crowd onto escalators in the People's Square subway station in Shanghai, China on 25 February 2009. Shanghai's subway system, with a total annual passenger flow of over 700 million, is the world's 10th largest transportation network in traffic. The city is also quickly expanding it's subway system, to accommodate a swelling population of over 23 million residents according to the latest census in 2010.