Passengers line for entering Zhengzhou Railway Station in Zhengzhou, capital of central China's Henan Province, Feb. 16, 2012. A total of 3.16 billion passenger trips are expected during this year's 40-day Spring Festival holiday travel rush, which will end on Feb. 16. The Spring Festival holiday, also known as the beginning of the Chinese Lunar New Year, is the country's biggest and most important holiday. (Xinhua/Wang Song)