This is a narrow-gauge railway.

这是一条窄轨铁路。

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Then by narrow gauge railroad into the Assam Valley to Chabua and fly over the Hump to Kunming.

然后坐小火车到阿萨姆邦的贾布尔基地，然后飞越驼峰到昆明。

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Symmetric switches are usually used in the process of narrow gauge transportation on tunnel construction site.

隧道施工窄轨运输过程中经常采用对称道岔。

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Even the gauge of the railway is controversial a narrow-gauge one to the south that would link seamlessly with China's network is the obvious option, and the one that people working on the project say is being adopted.

ECONOMIST: A tug of war between commercial logic and popular sentiment

The Butterley Gangroad, which was engineered by Benjamin Outram, was modernised in the 1840s and turned into a narrow gauge railway.

BBC: Derby

But the engine is unable to travel by rail line itself as it can only run on a two foot wide narrow gauge.

BBC: The Princess in 1871