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[quote user="Overmod"]If the technology actually involves block-signal equipment, then 'including' and 'working in concert with' are really similar in requiring full interfacing with equipment that has been adapted (for example by providing one-bulb one-aspect heads throughout) for that purpose.[/quote] I believe including or working in concert with open different ways to same goal, having the signaling system as an additional safety feature. As fall-back system? The railroads made dependend on the signaling system (including). The other way is to have stand-alone system that interconnects with the signaling system, by comparing the different system's indications and decide what to allow. [quote user="Overmod"]It will have occurred to you that the PTC 'mandate' involves at least four core functionalities that are not well-served by any one physical system, and hence that "PTC" itself is best provided by a coordinated software approach running across different physical systems -- one of which would likely include the pre-existing portions of an ABS installation that provide its track sensing and power, since there is a recognizable benefit in time and cost to re-using as much of that infrastructure as possible.[/quote] Sure, that was the reason why PTC was mandated. But PTC could handle it alone without the implementation of the signaling system. For some necessary detections it would be the easiest way to keep the track circuits.  The stand-alone would have saved the costs for a lot new signals und it would have allowed business benefits that the implemented system doesn't allow. I think the decision was made because the design of the implemented system seemed easier and faster to accomplish considering the dead line not because of §236.1007 (a) requirements. Regards, Volker
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