In wire systems, the car has pulley wheels which run along wires fixed between the sending and receiving stations. There may be a single wire (as in the Rapid Wire system) or a pair of wires (as in Gipe's system). The car may be propelled by gravity, a catapult or multiple-pulley arrangement, or by the separation of the wires at the sending end. As well as carrying cash, there was a variant of the Air-Line system which carried the purchased goods for wrapping in a wire basket.
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Carrier of a Lamson Air-Line wire system
Cover of a (U.S.) Lamson brochure, ca. 1917