摘要
The Golmud-Lhasa section of the Qinghai-Tibet Railway, extending 1,118 km and lying at an average elevation of some 3,000 meters above sea level, includes a 965 km section at 4,000 meters and a 140 km part at 5,000 meters. The highest railway bed, found in the Tanggula Mountain Pass, is 5,072 meters above sea level. The oxygen content in the air is 38-46 percent less than in the plains. Scarcity of oxygen and low atmospheric pressure affects human health and working ability, causing low working efficiency in both the workers as well as various machines operated by internal combustion engines.
