CN Freight Train
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 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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