An aerial drone photo taken on Feb. 23, 2025 shows the installation site of box girders of a high-speed railway linking Shanghai, Nanjing of Jiangsu Province and Hefei of Anhui Province in east China. The railway is part of China's high-speed rail network that centers around eight main vertical lines linking the north and south and eight horizontal lines connecting the east and west. (Photo by Zhang Biying/Xinhua)

An aerial drone photo taken on Feb. 23, 2025 shows the installation site of box girders of a high-speed railway linking Shanghai, Nanjing of Jiangsu Province and Hefei of Anhui Province in east China. The railway is part of China's high-speed rail network that centers around eight main vertical lines linking the north and south and eight horizontal lines connecting the east and west. (Xinhua/Liu Junxi)

An aerial drone photo taken on Feb. 23, 2025 shows the installation site of box girders of a high-speed railway linking Shanghai, Nanjing of Jiangsu Province and Hefei of Anhui Province in east China. The railway is part of China's high-speed rail network that centers around eight main vertical lines linking the north and south and eight horizontal lines connecting the east and west. (Photo by Zhang Biying/Xinhua)

An aerial drone photo taken on Feb. 23, 2025 shows the installation site of box girders of a high-speed railway linking Shanghai, Nanjing of Jiangsu Province and Hefei of Anhui Province in east China. The railway is part of China's high-speed rail network that centers around eight main vertical lines linking the north and south and eight horizontal lines connecting the east and west. (Xinhua/Liu Junxi)