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[quote user="oltmannd"]This is a very important point. The regs REQUIRE PTC to enforce existing signal system indications, as they exist. [/quote] Is this really the case? Here is the wording of the according paragraph as already posted above (bold emphasis by me): <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> </div> <div>The text allows two alternatives, including or working in concert. As I understand it, the railroads choose including. But what would have "working in concert" meant, perhaps a stand-alone PTC with logic interconnection to the existing signaling system? Regards, Volker</div>
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