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[quote user="BaltACD"]My practical understanding of 'including or working in concert' are two ways of saying the same thing and thus giving lawyers something to argue about in the law suits that will result when an accident is pinned on PTC failure.[/quote] My experience with standards show that the word or indicates a different approach. But I have to admit that my experience is limited to European standards. That is the reason for asking. And European standards are not put in laws. I remember an editorial in RailwayAge: <a href="https://www.railwayage.com/cs/the-tangled-tale-of-ptc/?RAchannel=home">https://www.railwayage.com/cs/the-tangled-tale-of-ptc/?RAchannel=home</a> and Wick Moormans rebuttal: <a href="https://www.railwayage.com/regulatory/untangling-the-tale-of-ptc/?RAchannel=home">https://www.railwayage.com/regulatory/untangling-the-tale-of-ptc/?RAchannel=home</a> I couldn't believe that the experts had overlooked the requirement to implement the signal system. So I looked for the wording. Since I found it, I'm not sure how to understand Wick Moorman's answer, an explanation or an excuse, naturally from my European viewpoint. Regards, Volker
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