History
As early as the 1940s, automatic defect detectors were installed to improve what was normally done with the human eye by railroad workers. The detectors would transmit their data via wired links to remote read-outs in stations, offices or interlocking towers. If a defect was detected, an alarm would sound and the employee on duty would bring the train to a halt using hand or automatic signals.
Read more about this topic: Defect Detector
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