Last Updated：2025/12/05
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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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Maintenance crews inspected the fourth rail to ensure the current-return system in the deep-level tunnels remained safe.
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Related words
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。
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