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There are two methods of delivering power to an electric train...

(1) Through overhead wires. The engine has a pantograph device on the roof. this is raised until it's in contact with the overhead wires. Current travels down the pantograph, and into the engine.

(2) Through a 'hot shoe' and 'third rail'. The current is fed to an extra rail running either to one side of the existing track, or 'sanwiched' between them. Again the hot-shoe delivers the current to the engine.

Overhead wires are more common in cross country lines, whereas third-rail systems are more common in underground (subway) systems - where overhead space is a premium.

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Q: How power supply is given to electric train?
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