How an electric locomotive works...

Electric locomotives have provided hauling power to trains since 1837. Unlike steam and diesel locomotives, electric locomotives do not carry their fuel on board. Rather, fuel could be located 100s of km away at an electric power station, in the form of coal or other energy sources, and delivered to the locomotive through wires.
An electric locomotive is essentially a box full of transformers and semiconductors that converts electricity collected from external sources to the desired voltage to drive the traction motors.

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Видео How an electric locomotive works... канала The Train Story