Railway workers across China are gearing up to handle the busiest days during the Spring Festival travel peak.

More than 6.4 million trips were made on the country's railway network on Thursday, the Ministry of Railways forecast, adding it temporarily scheduled 645 extra train trips to transport passengers flooding railway stations.

On Wednesday, passengers made more than 6.3 million trips on trains, and railway authorities operated 4,714 train trips after adding 663 temporary train trips.

Chinese tradition holds that people should return home and spend Spring Festival, the most important Chinese holiday, with their families, which creates an annual travel rush that is the world's largest recurrent human migration.

Chinese travelers made more than 235 million trips by train during the Spring Festival travel peak in 2012 - meaning nearly 6 million people took trains each day of the rush period.

The Ministry of Railways expects 220 million train trips to be made during this year's 40-day holiday rush, from Jan 26 to March 6, averaging 5.6 million a day.

A total of 54.4 million trips had already been made from Jan 26 to Monday, it said.

In Beijing, about 477,300 passengers departed from three major railway stations on Wednesday, 30,000 more than the busiest day last year.

In Beijing West Railway Station, once the biggest station in Asia before the city's south station opened in 2008, more than 220,000 passengers took trains on Wednesday, the busiest day since this year's rush period began.

More than 100 trains departed from the station, which has begun to operate 24 hours a day for the travel rush, from 2 pm to 10 pm. All of the station's nearly 2,000 employees have been kept on duty to handle the flood of passengers, and more than 700 volunteers have been added.

The station has also beefed up its security by mobilizing more than 1,000 police officers to patrol and crack down on theft.

The largest group of people returning home this week by train is white-collar workers. Most migrant workers and university students have already gone home, railway officials said.

To transport more passengers, railway authorities even launched overnight services on the Beijing-Guangzhou high-speed rail line. From Tuesday to Friday, seven temporary trips will be made overnight each day on the Wuhan-Guangzhou section of the line.

In addition, the Ministry of Railways has decided to begin the sales of tickets for Feb 28 and March 1 on Friday, ahead of the scheduled Saturday and Sunday, the Chinese New Year's Eve and Spring Festival.

The move aims to free travelers from the anxiety of scrambling for a ticket during Spring Festival, the ministry said.

Normally passengers can book tickets 20 days before their departure date. However, reserving a ticket during the Spring Festival travel peak has become a source of anxiety and a test of will.

The Ministry of Railways' ticket-booking website, 12306.cn, handled about 200,000 users a second on its busiest days before Spring Festival, recording as many as 1.5 billion hits a day.

Contact the writer at zhaolei@chinadaily.com.cn