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[quote user="dehusman"]Then you are only discussing trying to prevent collisions between trains operating in signaled territory or on a joint authority mandatory directive.[/quote] This thread started as follow up to the Arizona accident thread where the question arose if PTC had to prevent that accident. This thread was the attempt to bundle the answer. That doesn't mean the discussion is limited to this topic. In this light I didn't understand your post. As Zugmann said "restricted speed" is an operation procedure not a speed. [quote user="dehusman"]This discussion then would not consider collisions in non-signalled territory, in tracks other than a main track or in yard limits, all of which would fall outside the scope of 49 CFR 236.1005.[/quote] If I understood PTC correctly dark territory is not exempted from PTC when it fulfills the requirements that make PTC necessary in signaled territory. The dispatcher still issues track warrants by voice/data radio und PTC enforces the movement authorities. Mainline switches and derails must be tied into the PTC system. A stand-alone system would be able to avoid train collisions in dark territory too. A reworked I-EMTS might be able sometime too. In my point of view the PTC mandate was kept as small as possible, enough to prevent those accidents that endanger train passengers and the public most. Accidents among railroaders were not considered important enough, I fear. [quote user="dehusman"]How do you tell the PTC system that you are adding an engine to the train intentionally, and that it is not a case of an engine running into a standing train? The difference between a collison and a coupling is intent. [/quote] With the permission of the dispatcher the PTC system can be cut out. Here are some PTC locomotive displays: <a href="http://www.smartlocal202.org/site/assets/files/BNSF/BN_ROAD/PTC_Screen_Elements_9_27_2012.pdf">www.smartlocal202.org/site/assets/files/BNSF/BN_ROAD/PTC_Screen_Elements_9_27_2012.pdf</a> On page 1 under PTC-System States it shows "Cut Out" with the above explanation. Regards, Volker
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