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[quote user="mudchicken"]If half a football field is good enough, then maybe you have acceptable precision. The GPS myths still abound with those who buy-in to thev original false pretext. [/quote] I know it is not that precise. That is one of the reasons it is not used in the European Rail Traffic Management System (ERTMS). I think for a breaking curve under restricted speed you don't need the exact train end location. Take the EOT's GPS location or the calculated train end location and add a sufficient safety margin (perhaps 500 ft) and you have something to work with. But as Balt said it adds to the complexity. If PTC ever gets developed into system allowing moving block this will be a by-product. Regards, Volker
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