The rail-laying work of a 4,615-meter-long bridge crossing the Yarlung Zangbo River of the Lhasa-Nyingchi railway in Sangri County, southwest China's Tibet Autonomous Region, was completed on Sunday.

The Lhasa-Nyingchi railway features complex geological conditions, with a total length of 435 km, 75 percent of which are bridges and tunnels. The construction work began in 2015 and is expected to be completed in 2021.

(Cover: The construction site of the bridge crossing the Yarlung Zangbo River of the Lhasa-Nyingchi Railway in Sangri County of Shannan, southwest China's Tibet Autonomous Region. /VCG Photo)