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[quote user="Datafever"]Thanks for the picture. That device looks old. Do you know anything about the technology that it uses to calculate distance? Does it just measure axle rotation as cars do? Or is there telemetry involved? Is GPS used at all?<br>[/quote]<br><br>It's not an old device. Railroads need things that are rugged and reliable, not pretty and sexy.<br><br>The counter pulls the information from the axle tach on the locomotive that supplies information to the event recorder and speedometer. You can calibrate the counter on measured miles as you leave the initial terminal. <br><br>GPS is used more and more by railroads, but not in this type of device, yet.<br><br>S. Hadid<br>
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