track maintenance
Refers to the inspection, repair, and upkeep of railway tracks and related infrastructure. Often used in compound terms like 保線作業 (track maintenance work) or 保線区 (track maintenance section).
Trains were suspended due to nighttime track maintenance work.
He works in the track maintenance section of the railway company.
track maintenance section; section of track
railway maintenance personnel; track maintenance crew
Compound of 保 (preserve, maintain) and 線 (line, track). A straightforward kanji compound for railway track maintenance.