As the altimeter approaches 17,000 feet, a package of potato chips balloons outward until it ruptures a seam. Sunscreen and hand sanitizer erupt unbidden from bottles. In soft sleeper class, Chinese businessmen sprawl listlessly on their bunks, sucking oxygen from plastic hoses. The bathrooms smell of vomit.
The railroad cars offer enriched oxygen and supplemental oxygen, though they're not pressurized. Edema is a real possibility.
https://en.wikipedia.org/wiki/Qinghai%E2%80%93Tibet_Railway
Or this travelog:
http://www.sfgate.com/travel/article/HIGH-TRAIN-TO-TIBET-Wor...
As the altimeter approaches 17,000 feet, a package of potato chips balloons outward until it ruptures a seam. Sunscreen and hand sanitizer erupt unbidden from bottles. In soft sleeper class, Chinese businessmen sprawl listlessly on their bunks, sucking oxygen from plastic hoses. The bathrooms smell of vomit.