A couple kisses while waiting for a train at the Beijing railway station January 19, 2012. [Photo/Agencies]

A woman wipes her tears with her partner's scarf as they part at Beijing west railway station, January 19, 2012.[Photo/Agencies]

A passenger walks through a fence towards a checking point of train tickets outside Beijing west railway station, January 19, 2012.[Photo/Agencies]

A passenger sits inside a train at the Shanghai's railway station, January 19, 2012.[Photo/Agencies]

A passenger walks through a fence towards a checking point of train tickets outside Shanghai's railway station, January 19, 2012.[Photo/Agencies]

A passenger holding her child walks towards Beijing west railway station, January 19, 2012.[Photo/Agencies]

Chinese New Year, or Spring Festival, is the biggest of two "Golden Week" holidays, giving migrant workers their only chance of the year to return to their home provinces with gifts for their families. More than 200 million people are expected to take to the railways over this year's holiday, the biggest movement of humanity in the world.