Track laying work was carried out here Sunday on a grand bridge of the railway linking regional capital Lhasa and Nyingchi. (Photos: Xinhua)

The 435-km Lhasa-Nyingchi railway, 75 percent of which is bridges and tunnels, has a designed speed of 160 km/h, and is expected to be completed and put into operation in 2021.

Photo shows a grand bridge over the Yarlung Zangbo River built for Lhasa-Nyingchi railway in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Track layer driver Zhao Runze works at the construction site of the track laying on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.

Engineering technicians lay railway tracks on a grand bridge over the Yarlung Zangbo River in Gyaca County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 20, 2020.