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Operated, or activated, by placing coins in a slot. quotations examples
Just as a matter of information, the Pennsylvania Railroad has unattended coin-operated public telephones on its "Congressional Limiteds" between New York and Washington and on the "Broadway Limited" between New York and Chicago.
1960 July, Robert G. Lewis, publisher, Railway Age, “Letters to the Editor: Telephones in trains”, in Trains Illustrated, page 448