Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 170
vers. The first experimental interlocking installation was made in this country at Spuyter Duyvil Junction, New York City, in 1874. The first important installation on a commercial basis was made by the Manhattan Elevated lines in New York City in 1877-78. Interlocking resulted from the desire on… … Part. of Electro-Pneumatic Interlocking- Plant, Union Station, St. Louis. these levers one with the other that a clear signal could not be given unless the route was properly set up, and so that signals for conflicting movements could not be given. As the cost of labor is higher in the United…
Engineering
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