QJ 2-10-2 No. 918 approaches Qinglongqiao station in fog, after climbing the first stage of the zig-zag from the Nankou Pass.

• 2轴式的“前进”型蒸汽机车从南口站驶来，仿佛上了个台阶似的爬过了座座山坡，沿着之字形的铁路了来到了青龙桥站，雾霭蒙蒙。