Signal boxes also served as important communications hubs, connecting the disparate parts of a rail line and linking them together to allow the safe passage of trains.OverviewOn a system, signalling control is the process by which control is exercised over train movements by way of and to ensure that trains operate safely, over the correct route and to the. Originally, all signaling was done by. Points and signals were operated locally from individual levers or handles, requiring the signalman to walk between the various pieces of equipment to set them in. In any -based control system, proper identification is critical to ensuring that messages are properly received by their intended recipients. As such, signaling control points are provided with names or identifiers t.
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