祖国西部,地势险要,气候多变。西南高原群峰林立,重峦叠嶂,岭峻谷深;西北地区却是黄土高原和浩瀚无垠的沙漠,风季来临,黄沙蔽日,水源奇缺。这些地区新建铁路高填深挖、桥隧相连,工程浩大、环境艰苦,其施工的艰难远远超过了其他地区。可是筑路大军以惊人的毅力、坚韧不 West of the motherland, terrain, climate changeable. The peaks of the southwest plateau are numerous, with numerous peaks and valleys and deep ridge valleys. The northwest region is the loess plateau and vast expanse of desert. In these areas, the newly built high-fill and under-dredged railways are connected by bridges and tunnels. The project is huge and the environment is tough. The construction is far more difficult than other areas. However, the road building army with amazing perseverance, tough not