複ふく々ふく線せん

noun

four-track rail line; quadruple track

Railway term for a line with four tracks, typically two in each direction, allowing express and local services to run separately.

• この区く間かんは複ふく々ふく線せん化かされて、快かい速そくと各かく駅えき停てい車しゃが別べつの線せん路ろを走はしる。

  This section has been quadruple-tracked, so express and local trains run on separate tracks.