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[quote user="BaltACD"]Sorry pally! If 'off the shelf' PTC systems would have solved the interoperatability problems of the Class 1 carriers + Amtrak and all the various commuter rail agencies it would have been adopted in a heartbeat. Such was not the case. [/quote] I didn't talk about PTC. In the years before the mandate the railroads could have formulated the requirements. In Germany there was the PZB90 available, an intermittent cab signaling and train protection system. <a href="https://en.wikipedia.org/wiki/Punktf%C3%B6rmige_Zugbeeinflussung#Germany">https://en.wikipedia.org/wiki/Punktf%C3%B6rmige_Zugbeeinflussung#Germany</a> It is used on lines with speed limits up to 100 mph. Yes there were a number of systems in Europe. These systems are older than the European Union. So even better, the American Railroads had a number of system to choose the best from. Locomotives that run across a border into another safety system area are equipped accordingly. If I remember correctly run-through locomotives sometimes needed special equipment of neighboring railroads in the USA too. [quote user="BaltACD"]If PTC equipment wasn't being installed, the existing signal system would not have been suspended and the open switch would have been detected by that signal system.[/quote] As looks currently if CSX personnel had worked properly that accident would have been prevented. Regards, Volker
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