@white.dead - Yes, this is a shifted-load, dragging-equipment, hot bearing detector, which reports by radio as each train passes through. It's really handy to the fan with a scanner radio, but only from a few miles away. The radio range is not all that great. This detector reported the Amtrak train as: "BNSF Detector, Milepost Four Two Zero Point Seven, Main Two, No defects, Total Axles Thirty Six, Out". I've heard it report other things on freight trains, such as: "...You have a defect..." and "...Train too slow...", but never on Amtrak !
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