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.
More than 220 million passengers are expected to travel by train during the holiday. Despite improvements to the system, complaints about ticket scarcity are a hallmark of the season.
By Charles Riley @CRrileyCNN - Last updated February 07 2013 08:30 PM ET
