Tunnel on Guiyang-Nanning high speed railway drilled through(1/5)

The Jiuwandashan No. 4 tunnel on Guiyang-Nanning high speed railway is drilled through in Hechi City, south China's Guangxi Zhuang Autonomous Region, Aug. 17, 2022. (Photo: China News Service/Wang Yizhao)

The Guiyang-Nanning high speed railway is expected to start operation at the end of 2023 with a designed speed of 350 kilometers per hour.

The Jiuwandashan No. 4 tunnel on Guiyang-Nanning high speed railway is drilled though in Hechi City, south China's Guangxi Zhuang Autonomous Region, Aug. 17, 2022. (Photo: China News Service/Wang Yizhao)

The Jiuwandashan No. 4 tunnel on Guiyang-Nanning high speed railway is drilled though in Hechi City, south China's Guangxi Zhuang Autonomous Region, Aug. 17, 2022. (Photo: China News Service/Wang Yizhao)

Construction workers work at Jiuwandashan No. 4 tunnel on Guiyang-Nanning high speed railway in Hechi City, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Photo: China News Service/Jiang Xuelin)

Construction workers work at Jiuwandashan No. 4 tunnel on Guiyang-Nanning high speed railway in Hechi City, south China's Guangxi Zhuang Autonomous Region, Aug. 16, 2022. (Photo: China News Service/Jiang Xuelin)