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[quote user="Euclid"]Are we talking about PTC as defined by the mandate or PTC as defined by its conceptual limits? For the latter, PTC needs to be given eyes in the form of optical sensors. [/quote] I think we are talking about the mandated PTC. Restricted speed was exempted from PTC except control of max. speed during the law making process for cost and time reasons. PTC systems can be designed to know the rear end of a train. Look at stand-alone systems allowing moving block like the approved CBTC. <a href="https://en.wikipedia.org/wiki/Communications-based_train_control">https://en.wikipedia.org/wiki/Communications-based_train_control</a> I-EMTS is not able to this in its current design status. There will still be reasons for restricted speed like broken rails that might not get detected precisely enough to use PTC. A differently mandated PTC could have prevented the Arizona accident, I think. The upper limit of restricted speed is controlled by PTC according to 49 CFR §136.1005 (f): <a href="https://www.law.cornell.edu/cfr/text/49/236.1005">https://www.law.cornell.edu/cfr/text/49/236.1005</a> Quote: (f)Train-to-train collision. A <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="PTC" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=1e0274ce6881947214c675ca39a7ac75&term_occur=33&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">PTC</a> system shall be considered to be configured to prevent <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="train" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=824e9fa357b1816a2269230acafd22be&term_occur=30&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">train</a>-to-train collisions within the meaning of <a title="paragraph (a)" href="https://www.law.cornell.edu/cfr/text/49/236.1005#a">paragraph (a)</a> of this section if <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="trains" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=824e9fa357b1816a2269230acafd22be&term_occur=31&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">trains</a> are required to be operated at <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="restricted speed" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=12b93a77c6467a8edb60964bfc0d50c7&term_occur=3&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">restricted speed</a> and if the onboard <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="PTC" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=1e0274ce6881947214c675ca39a7ac75&term_occur=34&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">PTC</a> equipment enforces the upper limits of the railroad's <a class="colorbox-load definedterm init-colorbox-load-processed cboxElement" title="restricted speed" href="https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=12b93a77c6467a8edb60964bfc0d50c7&term_occur=4&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">restricted speed</a> rule (15 or 20 miles per hour)............ Regards, Volker
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