単たん線せん

noun

single track; single line

Refers to a railway line with a single set of tracks, where trains in both directions share the same track.

• この路ろ線せんは単たん線せんなので、すれ違ちがいに時じ間かんがかかる。

  This line is single-track, so passing each other takes time.

noun

solid wire; solid-core wire; single-strand wire

Used in electrical contexts to describe a wire consisting of a single solid conductor, as opposed to stranded wire.

• 単たん線せんは撚より線せんより曲まげにくいが、接せつ続ぞくが確かく実じつだ。

  Solid wire is harder to bend than stranded wire, but connections are more secure.