Question

Arm which is used in train to get electricity from wires

Answer 1

Answer:

A pantograph  is an apparatus mounted on the roof of an electric train, tram or electric bus[1] to collect power through contact with an overhead line. It is a common type of current collector. Typically, a single or double wire is used, with the return current running through the track. The term stems from the resemblance of some styles to the mechanical pantographs used for copying handwriting and drawings.

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