An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, trolleybuses or trams. It is known variously as:
Overhead catenaryOverhead contact system (OCS)Overhead equipment (OHE)Overhead line equipment (OLE or OHLE)Overhead lines (OHL)Overhead wiring (OHW)Traction wireTrolley wireIn this article, the generic term overhead line is used, as used by the International Union of Railways.
An overhead line consists of one or more wires (or rails, particularly in tunnels) situated over rail tracks, raised to a high electrical potential by connection to feeder stations at regular intervals. The feeder stations are usually fed from a high-voltage electrical grid.
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