It was particularly hard going on the 9.9 kilometer stretch from Santiaoling to Shihfen, where they had to build a total of six tunnels, many of which had to be cut directly out of the cliffs.
尤其從三貂嶺到十分，九．九公里的路段，共有六座隧道，許多是直接從岩壁上鑿出來的，十分驚險。