An aerial drone photo taken on Dec. 7, 2025 shows a construction site of Chongqing-Kunming High-Speed Railway in Zhaotong, southwest China's Yunnan Province. (Photo by Zhang Guangyu/Xinhua)

A constructor works at a construction site of Chongqing-Kunming High-Speed Railway in Zhaotong, southwest China's Yunnan Province, Dec. 7, 2025. (Photo by Zhang Guangyu/Xinhua)

Constructors work at a construction site of Chongqing-Kunming High-Speed Railway in Zhaotong, southwest China's Yunnan Province, Dec. 7, 2025. (Photo by Zhang Guangyu/Xinhua)

An aerial drone photo taken on Dec. 7, 2025 shows a construction site of Chongqing-Kunming High-Speed Railway in Zhaotong, southwest China's Yunnan Province. (Photo by Zhang Guangyu/Xinhua)