noun: An overhead rail forming a track on which a trolley runs to convey a load, as in a shop.
noun: A street railway laid in the streets of a town or city, or an interurban railway for local traffic, on which cable cars, or trolley cars, etc., are used, in distinction from an extended railway line for trains.
noun: A grooved rail (one of at least two) laid in a street for trams to run on. Ordinary rails are used on off-street (reserved track) sections of tramways.
