歯し軌き条じょう

noun

cog rail; rack rail

Technical term used in railway engineering for a toothed rail that meshes with a cogwheel, typically on steep gradients.

• この登と山ざん鉄てつ道どうは歯し軌き条じょうを使つかって急きゅう勾こう配ばいを登のぼる。

  This mountain railway uses a cog rail to climb steep gradients.