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[quote user="ATLANTIC CENTRAL"]As explained over and over by me and others, the old system, had it been working, would have prevented this crash.[/quote] Yes, but not others like Amtrak 501. What Overmod formulated first and I took up in my question is mentioned in the FRA cost-benefit analysis of PTC, IIRC. A number of independent industry experts criticized the railroads for asigning the signal department with the PTC development and thus giving away the named possible advantages.  Rolling block would rise the track capacity without the need of more track. Where is the back-up for the signal system? If equipment fails, it is designed failsafe. And the same can be done with PTC. BTW the European Train Control System (ETCS) will, in its advanced form, remove the need for lineside signals and allow a movable/rolling block. Regards, Volker
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