A dispatcher's wayside-to-train communications system

The title "wayside-to-train" applies to a series of equipments of unitized construction which can be grouped in various arrangements to fabricate a communications system which will permit a dispatcher, or anyone else at one or more central points, to talk directly with the crew of a train regardless of its location along a predetermined territory. The type, variety and nature of these equipments are sufficiently versatile to permit, in the majority of cases, the layout of a system as simple or as complex as an individual railroad desires, without requiring the design and fabrication of special or "custom" equipment.