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Tim, I would like to give this one a shot with my limited knowledge. I know that some of the BNSF units have GPS (was told this by a RFE), but I don't think that this used by the DSs yet. I was taught that the DS can't see exactly where you are if you are between control points. That means if you are knocking down intermediate signals, they can't see that you just knocked down the intermediate at MP 120.5. They can see when you knock down an absolute though. The absolute signals are controlled by an operator and the intermediates are controlled by track conditions (train fouling that block, weed weasels shunting the track). Intermediates have number plates on their masts and or grade markers). As far as speed sensors, all that I know of are Trackside warning detectors. Some will give speed along with a defect message, and temperature (for temp.related speed restrictions) along with milepost number. Not all are alike though. To my knowledge these detectors do not flag the DS as to speed etc. They do however transmit over the radio their message. I'm not sure if the DS can hear these transmissions. They are rather weak. Sometimes you can barely pick up the message from a train that is several detectors ahead or behind. Like I say, that is what I was taught on my road. Hope that I didn't mislead you.......
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