Only considering the existence and development of permafrost and the engineering damage in the cold regions, the Qinghai Xizang railway line should be thought as the best one among all plans.

• 提出就青藏高原上普遍发育的多年冻土及寒冷地区存在的工程病害来讲，青藏线明显优于其它各条进藏规划线路。