Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A railway switching network is designed to control railway traffic control devices including railway switches and signals within a given area from a single point. Such control is exercised through the use of various track circuits which detect the presence of trains on a rail as well as other signal transmission devices. The history of railway signaling and switching dates back to 1841: both railway semaphore signals as well as the methods behind railway routing and blocking developed in parallel, bringing into existence the railway switching network.

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