Passengers cram into a train carriage of a new subway line during a four-day free trial in Hangzhou city, capital of East China's Zhejiang province on Nov 20, 2012. The subway issued 600,000 tickets to citizens to ride for the free and about 70,000 citizens rushed into the subway on the third day of the promotion. [Photo/CFP]

Passengers poured into the check-in gate of a new subway on the first day of its four-day free trial operation in Hangzhou city, capital of East China's Zhejiang province on Nov 18, 2012. The subway issued 600,000 tickets to citizens to ride for free and more than 30,000 citizens rushed into the subway on the first day of the promotion. [Photo/CFP]