A woman and boy wait as Chinese travelers queue up at the main entrance of the Beijing railway station in Beijing, Friday, February 13, 2015. Millions of Chinese will be traveling to their hometowns to celebrate the Lunar New Year on Feb. 19 this year which marks the Year of the Sheep on the Chinese zodiac. (Photo by Andy Wong/AP Photo)

People pass a suitcase as they line up to enter a railway station in Beijing, February 15, 2015. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which started on February 4 and will last until March 16, Xinhua News Agency reported. (Photo by Reuters/Stringer)

A man kisses a girl at a crowded railway station in Harbin, Heilongjiang province, February 16, 2015. (Photo by Reuters/Stringer)

People crowd at a railway station in Harbin, Heilongjiang province, February 16, 2015. (Photo by Reuters/Stringer)

A man yawns at a railway station in Taiyuan, Shanxi province, February 16, 2015. (Photo by Jon Woo/Reuters)

A man carries his daughter on his luggage case at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A boy carries a backpack in the shape of Xiyangyang, a cartoon character also known as Pleasant Goat, at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Passengers stand on lines to enter platforms while paramilitary policemen stand guards at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Passengers wait in a line to enter a platform at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A man carries sacks as he stand in a line to enter a platform at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Policemen stand guard at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A man carries his belongings with a stick at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A woman sits on her luggage case at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Passengers stand in lines to enter platforms at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Lip-shaped patterns are seen on a pair of jeans at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A couple kisses at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)

People sit on stools as they wait for their trains in front of paramilitary policemen at a railway station in Beijing February 16, 2015. (Photo by Kim Kyung-Hoon/Reuters)