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[quote user="BaltACD"]I suspect trying to interface relay dependent circuitry with electronic circuitry can be a real adventure.  My guess is that the railroads felt it was more economic and more reliable to do a 'clean installation' of 21st Century signal technology when installing equipment to support PTC requirements.[/quote] My question is why designing a PTS system based on GPS and then not use the advantages like e.g.: lineside signals only in specific locations, rolling block? Is the chosen PTC system in this light really the most cost effective? Regards, Volker
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