1900 16 220 This rail..is known as the ‘power rail’, it forming one terminal of the electrical system.
1962 23 May 9/3 Another advantage..is that the overhead power rail and driving wheels are blocked in by a sort of conduit, thus assuring protection against all weather hazards.
2005 (Nexis) 21 Mar. 12 Cadence and ARM automated the insertion of level shifters, hooking them up to power rails and optimizing placement for area and timing.