

Morning commuters swarm through the People's Square subway interchange station in downtown Shanghai, China on 13 July 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.
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Copyright Qilai Shen
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