plain line

Noun

(rail transport) a stretch of railway track that does not have any junctions, crossovers or points on it.

Japanese Meaning

交差や分岐（ポイント）が存在しない鉄道の線路区間

The maintenance crew inspected the plain line for signs of wear before the freight train passed.

保守班は貨物列車が通過する前に、分岐やポイントのない直線区間の線路を摩耗の兆候がないか点検した。

Sense（1）

(rail transport) a stretch of railway track that does not have any junctions, crossovers or points on it.

plain lines

（ plural ）