BEIJING — China's railway network had a total length of 141,400 km by the end of July, among which 36,000 km were high-speed railways, the national railway operator said on Aug 8.

The country invested 67.1 billion yuan (about $9.67 billion) in rail fixed asset in July, up 3.6 percent year-on-year, according to a statement on the website of the China Railway Corporation.

Investment on big and medium-sized rail projects hit 49.9 billion yuan last month, representing a year-on-year growth of 11.3 percent.

During the first seven months, 1,310 km of new railway lines had been put into service, including 733 km of high-speed railway, the statement said.