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by Railway Signal Association (Author)
A comprehensive guide to the standards and specifications of railway signal operations. This manual provides valuable insights into the history and development of railway signals, as well as practical advice for signal engineers and technicians.
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.
This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.
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