Last Updated
：2025/12/05
fourth rail
Noun
Japanese Meaning
地下鉄において、通常の走行レールおよび第三レール（高電圧線）とは別に設置される、主に電流還流用の追加レール。特にロンドン地下鉄で使用される。
（ plural ）
Quizzes for review
(rail transport) An extra rail in addition to the third rail (live rail) which is used for current return purposes, mainly by London Underground, because of problems caused by using the running rails for current return underground.
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fourth rail
Maintenance crews inspected the fourth rail to ensure the current-return system in the deep-level tunnels remained safe.
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Maintenance crews inspected the fourth rail to ensure the current-return system in the deep-level tunnels remained safe.
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