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BNSF Arizona Collision on Transcon, One Dead

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[quote user="Euclid"]I am just curious. Why doesen't PTC prevent collisions at restricted speed? Can it be modified so it can do that? If so, why is that feature omitted? [/quote] I'm not sure about restricted speed requirements. For me it looks like PTC has to prevent train to train collissions at restricted speed. But I admit that as foreigner I have sometime problems interpreting legal language correctly: <a href="https://www.law.cornell.edu/cfr/text/49/236.1005">https://www.law.cornell.edu/cfr/text/49/236.1005</a> 49 CFR 236.1005 Requirements of Positive Train Control systems (a)PTC system requirements. Each <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=1&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">PTC</a> system required to be installed under this subpart shall: (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). This application applies to: (1) Operating conditions under which <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=32&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">trains</a> are required by signal indication or operating rule to: (i) Stop before continuing; or (ii) Reduce speed to <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=5&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">restricted speed</a> and continue 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=6&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">restricted speed</a> until encountering a more favorable indication or as provided by operating rule. (2) Operation of <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=33&term_src=Title:49:Subtitle:B:Chapter:II:Part:236:Subpart:I:236.1005">trains</a> within the limits of a joint mandatory directive. Perhaps I read it wrong. Even if it were not required, it shouldn't be a technical problem to design it. Regards, Volker
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