Fun term

third rail

Essential subway/rail infrastructure vocabulary

An additional rail usually found in subway systems, running parallel to the existing tracks, and sometimes slightly elevated. The third rail carries a live electric current which is used to power the subway trains.

"No Trespassing - DANGER THIRD RAIL"

View on Urban Dictionary Written by Mr. X-106 on Urban Dictionary

Quoted from Urban Dictionary under their terms, with attribution. Definitions there are written by the public and are not edited by us.

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