Historically, the 110 V battery located in the main locomotive was the source of dc power for most electrical rail applications. This meant providing light to the carriages required running cables along the full train length.
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DC will consume less energy when operating under service conditions. The equipment in the system will cost less to build and there is no need to produce the conversion technology to ensure that the train can run on AC power.
Overhead line equipment (OLE) refers to the overhead wires and supporting infrastructure that carry electricity at 25,000 volts to power electric trains.