trolley pole

== English == === Etymology === A trolley wheel (a wheel that trolls along a wire) at the end of a pole. === Noun === trolley pole (plural trolley poles) A pole of wood or metal, used to transfer electricity from an overhead wire to power a tram, streetcar or trolley bus. === See also === bow collector pantograph === Further reading === trolley pole on Wikipedia.Wikipedia Category:trolley poles on Wikimedia Commons.Wikimedia Commons