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With over 960 km of track being more than 4,000 m above sea level, [the Qinghai-Tibet Railway, pictured,] is the highest railway line in the world. The Tanggula railway station at 5,068 m is the world's highest railway station.
https://en.wikipedia.org/wiki/Qinghai%E2%80%93Tibet_railway
Image credit: Windmemories/CC BY-SA 4.0 (cropped)
https://commons.wikimedia.org/wiki/File:20140504_NJ2-0022_and_NJ2-0033_on_Qingzang_Railway_near_Lhasa_02.jpg
