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BEIJING, CHINA - JANUARY 26: (CHINA OUT) Passengers wait for trains at Beijing West Railway Station on January 26, 2014 in Beijing, China. The Chinese Spring Festival travel rush began on January 16 and about 3.62 billion passenger trips are expected to be made across the country, with around 257 million train trips during the 40-day lunar New Year travel period. (Photo by ChinaFotoPress/Getty Images)
BEIJING, CHINA - JANUARY 26: (CHINA OUT) Passengers wait for trains at Beijing West Railway Station on January 26, 2014 in Beijing, China. The Chinese Spring Festival travel rush began on January 16 and about 3.62 billion passenger trips are expected to be made across the country, with around 257 million train trips during the 40-day lunar New Year travel period. (Photo by ChinaFotoPress/Getty Images)

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The world's largest annual mass migration is underway in China for the upcoming Lunar New Year. CNN's Isha Sesay reports.

The world's largest mass migration

The world's largest annual mass migration is underway in China for the upcoming Lunar New Year. CNN's Isha Sesay reports.