A total of 606.48 million people traveled via China's railways during the first four months of 2012, a year-on-year increase of 2.8 percent.
Construction on a heavy-haul railway that will link major coal producers in Shanxi province with a sea outlet in eastern Shandong province began on Saturday.
China's Ministry of Railways said Tuesday the country's railways carried a record high of nearly 30 million passengers during the International Labor Day holiday.
Beijing's subway lines posted a record daily passenger trips of 8.39 million on Saturday, according to the Beijing MTR Corporation.
As the three-day International Labor Day holiday begins in China, a record number of 8.2 million passengers traveled by train on Sunday.
With 3,500 kilometers of new high-speed railways expected to be put into use this year, the length of China's high-speed railways will exceed 10,000 kilometers, a senior railway official said.