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BNSF Arizona Collision on Transcon, One Dead

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I think PTC could do more. The limitation currently is more the mandate than the concept. One example is the moving block that would have been within the mandate but the chosen overlay system doesn't support it. To provide moving block PTC needs to know were the preceeding train's rear end is to brake in time to prevent a rear end collision. So the PTS concept would allow to prevent collisions between trains under restricted speed. It is not implemented. Non-railroad related are a different story. I think PTC would be able to integrate a system that detects if a road crossing at grade is occupied by vehicles. Detection can be by radar scanner, infrared light barrier or induction loops. Here a radar scanner with 3 reflectors (2 visible): <a href="http://www.ostbahn.org/ecmf_edul/bue57_318a.jpg">http://www.ostbahn.org/ecmf_edul/bue57_318a.jpg</a><a> </a><a href="http://www.ostbahn.org/ecmf_edul/bue57_318b.jpg">http://www.ostbahn.org/ecmf_edul/bue57_318b.jpg</a> For cost reasons it is unlikely that this system gets implemented. I just post it to show that, at least in my opinion, Euclid's assumption is right that the current PTC is more limited by the mandate and its realization than the PTC's possibilities itself. Regards, Volker
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