HUANJIANG, Aug. 21 (Xinhua) -- The Jiuwandashan No. 4 tunnel in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, was drilled through on Aug. 17, marking the completion of all 108 tunnels of Guiyang-Nanning high-speed railway line. The 15,485-meter tunnel is the longest first-class high-risk tunnel in the Guangxi section of the high-speed railway.
The Guiyang-Nanning high-speed railway, with a maximum speed of 350 km per hour, is expected to go into service in 2023.
Aerial photo taken on Aug. 16, 2022 shows the construction site of Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Cao Yiming)
Aerial panoramic photo taken on Aug. 16, 2022 shows the construction site of the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Cao Yiming)
A worker operates at Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Xinhua/Cao Yiming)
Workers are seen at Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Xinhua/Cao Yiming)
A technician works at Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Xinhua/Cao Yiming)
Technicians work at Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Xinhua/Cao Yiming)
Workers celebrate at Jiuwandashan No.4 tunnel along the Guiyang-Nanning high-speed railway in Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Aug. 17, 2022. (Xinhua/Cao Yiming)
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