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[quote user="dehusman"]People first have to define what they mean by "enforce restricted speed". Restricted speed is designed to intentionally allow "collisions" between equipment.[/quote] We are not talking about intended collisions/couplings but "restricted speed", a speed that will permit stopping within one-half the range of vision. What PTC is required to do at "restricted speed" is found in 49 CFR §236.1005 linked above. Coupling cannot prevented by PTC as long as it doesn't know the location of every single car. That is unlikely to ever come. At best it will perhaps sometime know the location of head end and rear end of a train to prevent "restricted speed" accidents like in Arizona. Regards, Volker
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