A staff member works on a test train at Guiyang North Station in Guiyang, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua/Liu Xu]

A driver prepares for the departure of a test train at Guiyang North Station in Guiyang, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua/Liu Xu]

A test train passes a grand bridge in Guiding County, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Photo by Long Jianrui/Xinhua]

Test train 55311 departs from Guiyang North Station in Guiyang, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua/Liu Xu]

Test train 55311 is seen before departure at Guiyang North Station in Guiyang, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua/Liu Xu]

Test train 55311 departs from Guiyang North Station in Guiyang, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua/Liu Xu]

Test train 55311 passes a grand bridge in Longli County, southwest China's Guizhou Province, June 26, 2023. With the departure of test train 55311 from Guiyang North Station, the Guiyang-Nanning high-speed railway officially started its operation tests on Monday.

The railway, with a designed speed of 350 kilometers per hour, connects Guiyang of Guizhou Province and Nanning of Guangxi Zhuang Autonomous Region. [Xinhua]