Passengers wait to board trains ahead of the Chinese Lunar New Year, at Nanjing Railway Station in Jiangsu province, China on January 31, 2018. (Photo by Reuters/China Daily)





A child cries on a suitcase at Shanghai's Hongqiao Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year in Shanghai, China on February 1, 2018. (Photo by Aly Song/Reuters)





Security personnel take position at the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





Members of a SWAT team take positions at the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





Passengers wait to board trains at Shanghai's Hongqiao Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year in Shanghai, China on February 1, 2018. (Photo by Aly Song/Reuters)





People wait in line to board a train at Nanjing railway station as the travel rush for Chinese Lunar New Year, or Spring festival, begins, in Jiangsu province, China on February 1, 2018. (Photo by Reuters/China Daily)





Passengers experience a head massage at Shanghai's Hongqiao Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year in Shanghai, China on February 1, 2018. (Photo by Aly Song/Reuters)





Passengers wait to board trains at Jiaxing railway station, ahead of the Chinese Lunar New Year, or the Spring festival, in Jiaxing, Zhejiang province, China on February 1, 2018. (Photo by Reuters/China Stringer Network)





Passengers are reflected in the widow of a ticket booth at the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





Bags and suitcases are seen at Shenyang North railway station as people travel ahead of the Chinese Lunar New Year, or the Spring festival, in Liaoning province, China on February 1, 2018. (Photo by Reuters/China Stringer Network)





Passengers wait to board trains ahead of the Chinese Lunar New Year, at Nanjing Railway Station in Jiangsu province, China on February 1, 2018. (Photo by Reuters/China Daily)





A passenger holds her luggage at the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





Passengers carry luggage toward the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





A passenger looks at security personnel deployed at the Beijing Railway Station as the annual Spring Festival travel rush begins ahead of the Chinese Lunar New Year, in central Beijing, China on February 1, 2018. (Photo by Damir Sagolj/Reuters)





Aerial view of CRH bullet trains setting out ahead of Spring Festival travel rush on January 31, 2018 in Hefei, Anhui Province of China. About 2.98 billion trips will be made during the 40-day Spring Festival travel rush. China will take multiple measures to ensure a smooth Spring Festival travel rush. (Photo by VCG/VCG via Getty Images)