China's National Development and Reform Commission has revealed its approval of three new railway projects on September11, 2015.[Photo:baidu.com]

China's economic regulator has approved the construction of three new railroads in central and southwestern regions.

The project has an estimated total investment of 143 billion yuan, or around 22 billion U.S. dollars.

One of the new high-speed railways will link cities in Henan and Hubei provinces with Chongqing municipality. At 118 billion yuan, it's the biggest among the new projects.

With a top speed of 350 km, the 800-km-long railway is expected to carry 60 million passengers per year.

The two other tracks will be traditional rail and help improve transportation in Yunnan in the southwest.

The construction of the three railroads is expected to be completed in the next 4 to 6 years.