《大国速度 百年京张》1（续二）From Steam to HSR—100 Years on the Beijing-Zhangjiakou Line (Excerpt)

修建京张铁路，最困难的是从南口到青龙桥这一段。

主要是山势陡峭坡度高，还需要修很长的隧道。2作为总工程师，詹天佑每天骑着毛驴，亲自与工程技术人员去实地进行勘测。无论是骄阳似火，或是狂风大作，还是暴雨如注，他总是身背标杆和测量仪，奔波在崎岖的山间小路上。

The most difficult section was from Nankou to Qinglong Bridge. The main difficulties were the steep gradients and the long tunnels required. As chief engineer， Zhan rode a donkey and went in person every day with engineering staff to survey the sites. In scorching sun， gales and storms， he would traverse the rugged mountain paths， a surveyor’s pole and a gauge on his back.

詹天佑带领工程技术人员，历尽艰险前后勘测了三条线路。（剩余4368字）