Scenes from China's annual migration

Hundreds of millions of Chinese are now traveling home to celebrate the Lunar New Year. It's the largest human migration on earth -- and it stretches the country's transportation system to the limit.

lunar 4

These travelers are taking the train from Beijing to the southwestern Chinese city of Chongqing. The trip takes 32 hours.

  @CRrileyCNN - Last updated February 07 2013 08:30 PM ET

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