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.

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Passengers on a train from Guangzhou to Changchun. China's government estimates that 3.4 billion trips will be taken during the 40-day holiday travel period.

- Last updated February 07 2013 08:30 PM ET

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