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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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Is the metro rail train using ac or dc power supply?
dc power supply
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Why don't you get shock in electric train?
If the track is fed by overhead power lines then the track is the return path for the electric current and is at earth potential.That is 0 volts
