Found 2 items, similar to third rail.
English → English (WordNet) Definition: third rail third rail n : a rail through which electric current is supplied to an electric locomotive
English → English (gcide) Definition: Third rail Third rail \Third rail\ (Electric Railways) (a) The third rail used in the third-rail system. (b) An electric railway using such a rail. [Colloq.] [Webster 1913 Suppl.]