China will see a surge of rail travelers during the Tomb-sweeping Day holiday starting Sunday.

China Railway, the national railway operator, expects the number of trips in the country to hit 45.2 million over the four-day travel rush, a 9.5 percent increase year on year.

The travel peak is expected on Sunday when train trips could reach 12.8 million, up 10.1 percent year on year.

The company said it would add more trains to meet demand.

Tomb-sweeping Day, also known as Qingming Festival, is the most important occasion for Chinese to honor their ancestors.