Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 169
MODERN RAILROAD SIGNALLING. 153 that the' construction of an additional track, entailing a much larger expense may frequently be indefinitely postponed. Interlocking. Interlocking, a short name for interlocking plant, has been defined as "An arrangement of switch, lock and signal appliances so… … Automatic Block Signals, Upper Quadrant. Alternative Current, Sema- phore Type. North Carolina. in a predetermined order." The term includes the cabin, the machine, switches and signals and all the connections and ap- purtenances. Patents for manually operated interlocking devices were first…
Engineering
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