fourth rail
The act by one country (chiefly Russia) of inducing residents of another country to take up the citizenship of (and possess a passport from) the first country.
(informal) tall and slender
(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.
Not bewildering.
保守作業員は、ロンドン地下鉄で使用される追加の返電用レール（第4レール）を点検し、深いトンネル内の返電システムが安全であることを確認した。
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DiQt
Free
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