The development of railroad signaling systems evolved with the need to provide interlocking between points and signals, and block working to keep trains a safe distance apart. Accordingly, the archetypal behavior of train control is summed up as providing (1) safe and efficient train movement by (2) the management of train routing and separation. This has been rudimentary since the advent of railway signaling and propagated in even the most contemporary of technologies today.
Evolutions in Railway Signaling: A “New Age” of Control?
Fraser, C. "Evolutions in Railway Signaling: A “New Age” of Control?." Proceedings of the 2009 Joint Rail Conference. 2009 Joint Rail Conference. Pueblo, Colorado, USA. March 4–5, 2009. pp. 251-260. ASME. https://doi.org/10.1115/JRC2009-63027
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