這是5月14日在云南鐵路博物館拍攝的不同鋼軌。云南鐵路博物館位于昆明市北京路昆明北火車站內，是一座兼具“車站上的博物館”與“博物館中的車站”雙重屬性的專題展館。該館以百年云南鐵路發展史為主線，系統呈現了從米軌、寸軌到準軌，從蒸汽機車到高鐵的跨越式演進歷程。[新華社記者 陳欣波 攝]

Samples of different railway tracks are pictured at 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)