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The speedometer has an optical encoder that is connected to a precision machined shaft and rubber wheel that makes contact with the locomotive wheel. The speedometer calculates the scale speed of the locomotive by measuring the rpm of the encoder shaft that is turned by the locomotive wheel. In effect, the encoder measures the distance traveled by the locomotive wheel, irrespective of the wheel diameter, and speed = distance / time. The AO Rail Speedometer also has wifi for downloading
any firmware updates. The speedometer includes a power supply and operates completely independent of the DC or DCC system that is connected to the rolling road.
demo video of the AO Rail Speedometer and Rolling Road
