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  I think the promlem is that the railroads designed PTC as an overlay to the existing signal system. It depends on its functions. To connect the two you have to shut down the signals. BN once designed ACSES as a stand-alone kind of PTC. Track circuits are the best way to detect broken rails as required in 49 CFR 236.1005 (5) Another paragraph of this is the reason given by the railroads for the overlay design: <div>§ 236.1007 Additional requirements for high-speed service. (a) A <a title="PTC railroad" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=6623f159ff8ad59cc8d72161e13c4d40&term_occur=1&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1007">PTC railroad</a> that conducts a passenger operation at or greater than 60 miles per hour or a freight operation at or greater than 50 miles per hour shall have installed a <a title="PTC" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=1e0274ce6881947214c675ca39a7ac75&term_occur=1&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1007">PTC</a> system including or working in concert with technology that includes all of the safety-critical functional attributes of a block signal system meeting the requirements of this part, including appropriate fouling circuits and broken rail detection (or equivalent safeguards).</div> <div>If this requirement really demanded for an overlay system or if a stand-alone with logic interconnection would have been possible I don't know. But even the temporary shut-down would have been necessary. Regards, Volker</div>
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