Planet's top mass travel frenzy begins

Ticketless trips helping ease bottlenecks

The world's largest annual human migration - the Spring Festival travel rush - kicked off on Monday, with nearly 3 billion trips expected to be made in the 40 days from Jan 21 to March 1.

On the first day of the rush, railway departments across the country handled an estimated 9 million train trips, according to China Railway Corp, the national railway operator.