This aerial photo taken on Nov. 28, 2023 shows a high-speed passenger train running along the Sichuan-Qinghai railway (up) and a high-speed passenger train running along the Xi'an-Chengdu high-speed railway (down) in Chengdu, southwest China's Sichuan Province. A 238-km section of the Sichuan-Qinghai railway in western China became operational on Tuesday after 12 years of construction. (Xinhua/Wang Xi)