(250517) -- KUNMING, May 17, 2025 (Xinhua) -- People visit Yunnan Railway Museum in Kunming, southwest China's Yunnan Province, May 14, 2025. Housed in Kunming North Railway Station, the Yunnan Railway Museum takes the century-long development history of Yunnan railway as the leading story line to narrate the frog-leaping evolution railway gauge standards from meter gauge to inch gauge, and standard gauge, as well as railway technologies from steam locomotives to high-speed rails. (Xinhua/Chen Xinbo)