An aerial drone photo taken on March 6, 2025 shows the closed Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region. (Xinhua/Li Zhipeng)WUHAI, March 6 (Xinhua) -- The Heyuancun Grand Bridge was successfully closed on Thursday, marking the completion of the bridges and tunnels within the Inner Mongolia section of Baotou-Yinchuan High-speed Railway, which links Baotou in Inner Mongolia and Yinchuan in northwest China's Ningxia Hui Autonomous Region.A bridge builder works at the construction site of the Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region, March 6, 2025. (Xinhua/Li Zhipeng)An aerial drone photo taken on March 6, 2025 shows the closed Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region. (Xinhua/Li Zhipeng)Bridge builders work at the construction site of the Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region, March 6, 2025. (Xinhua/Li Zhipeng)A drone photo taken on March 6, 2025 shows the closed Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region. (Xinhua/Li Zhipeng)Bridge builders work at the construction site of the Heyuancun Grand Bridge of Baotou-Yinchuan High-speed Railway in north China's Inner Mongolia Autonomous Region, March 6, 2025. (Xinhua/Li Zhipeng)