Passengers move to board a train in Heifei Railway Station in Hefei, capital of esat China's Anhui Province, Feb. 15, 2015. The Heifei Railway Station is expecting to handle 880,000 trips on Sunday, four days ahead of the Spring Festival. Taking place annually ahead of the Spring Festival holiday, the travel spree, known as "Chunyun" in Chinese, is considered the world's largest human migration, with hundreds of millions of Chinese people traveling home to reunite with family. (Xinhua/Du Yu)