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Tom, You have purposefully misrepresented what I said. You know it. Everyone who reads through this thread knows it. I never ever said GPS should supplement lineside signals. You are the one who implied that, not me. What I have said (and I will paraphrase for you) is that consist-centric signalling aka radar and radar detection (simple, cheap stuff, you can buy it all at your local Schucks or Napa auto parts stores) can be the solution to the lack of pin-point accuracy of state of the art centralized control aka GPS. The GPS lets distpatch know where everyone is, the radar/radar detection lets the road crews know how close they are to the next/following consist is. Block signals are old hat, and as such they could be eliminated, if indeed their usefulness in detecting and warning of rail malformities is not consistent.
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