Overhead lines
single or rarely double wire used to transmit electrical energy to trains, trams, or trolleybuses, hanging above the route of the vehicle
Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains at a distance from the energy supply point. This may be abbreviated to OHL or OHLE for OverHead Line Equipment.

The outdoor overhead lines of a Swiss Federal Railways track.
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