noun
abandoned railway line; closed line; discontinued line
Refers to a railway line that has been permanently taken out of service, often with tracks removed or repurposed.
この町には昔、廃線になった鉄道の跡が残っている。
In this town, traces of an old abandoned railway line remain.
廃線のトンネルが遊歩道として整備された。
The tunnel of the discontinued line was turned into a walking trail.