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Experimental public radio-telephone service for train passengers was inaugurated by the Bell Telephone System several years ago. Initial installations operated in conjunction with a series of urban mobile base stations. More recently, highway mobile systems have been used for this service, and this paper describes a typical train installation operating through a highway channel. All of these early systems utilized an attendant on the train. The cost of providing an attendant has, in some cases, been found excessive. Consequently, experiments have been initiated in which a coin box is used on the train. The arrangements for this purpose are also described.