Maybe someone is familiar with a "defect detector" and how it gives a reading. Here is a video of a CN freight going through a crossing that is monitored. Take a look and listen to readout at the end: click here 
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Most detectors are journal hot box detectors and axle counters. The hot box detector works usinginfrared detectors. Not sure how the axles are counted. Both info data are transmitted via radio to train and responded to by conductor.
Thank you!
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