China's train passengers totalled 6.33 million on Friday, the busiest day in the country's history falling at end of the Spring Festival holiday, the Ministry of Railways (MOR) said Saturday.

The number is an increase of 11.5 percent from the same day last year, as millions of people began to return to work as the one-week holiday neared its end.

Trains have run smoothly and safely so far with no complaints, said the ministry.

The MOR estimated before Spring Festival that 210 million passengers would travel during the 40-day rush period beginning Jan. 30, a 9.5 percent rise from a year earlier.

Spring Festival, or Chinese Lunar New Year, fell on Feb. 14 this year. It is the most important Chinese traditional festival of family reunions.