The Qinghai-Tibet railway runs for an incredible 960 kilometres over mountains which are over 4,000 meters above sea level. In order to assure that the high level rail railway runs efficiently, powerful locomotives are the main components of reliable operation of the Qinghai-Tibet railway. The locomotives are designed to have special characteristics for running over the severe gradients of the Qinghai-Tibet route. The total length of the second phase of Qinghai-Tibet railway from Gomud to Lhasa is 1142 kilometres. About 550 kilometres of the line were built on frozen earth. The demanding climatic conditions include high elevation, low air pressure, thin air, severe cold, significant temperature changes, strong sandstorms. ect. all add to the complexity of operating this line. At present, the locomotives running on the Qinghai-Tibet railway are "Snowland Ship" NJ2 diesel locomotives which operate alongside new DF 8B and DF 7G locomotives.
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