In this Wednesday, January 23, 2019, file photo, a child sits on a piece of luggage as she and others wait for their train at the Beijing railway station in Beijing. The world's largest annual migration began this week in China with millions of Chinese are traveling to their hometowns to celebrate the Lunar New Year on Feb. 5 this year which marks the Year of the pig on the Chinese zodiac. (Photo by Andy Wong/AP Photo)
