An overhead line is a set of wires suspended above a railway track, used to supply electrical power to trains. These wires are connected to the train through a device called a pantograph, which collects electricity as the train moves. Overhead lines are commonly used in electric train systems, especially in areas where using a third rail is not possible. This system allows trains to run on electricity, reducing the need for fuel and helping to lower emissions while providing an efficient form of transportation.

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