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third rail
(redirected from Forth-rail)

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
third rail
n.
1. The rail that supplies the high voltage to power a train on an electric railway.
2. A subject that tends to be avoided because of its offensive or controversial nature: "Social Security, the 'third rail' of American politics" (Charles Stein).

third rail
n
(Transport / Railways) an extra rail from which an electric train picks up current by means of a sliding collector to feed power to its motors
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.third rail - a rail through which electric current is supplied to an electric locomotive
rails, runway, rail, track - a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll


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