A defect detector is a system used on railways to automatically check trains for potential issues while they are in motion. These detectors are typically installed along the track and use sensors to monitor various parts of the train, such as wheels, axles, and brakes. When a defect is detected, such as an overheated wheel or a mechanical problem, the system sends an alert to the train crew or station so that the issue can be addressed before it causes an accident. Defect detectors help improve safety by providing an early warning of potential problems, reducing the need for manual inspections.

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