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BN had experimented with ARES, a stand-alone system. The merger with ATSF ended the project. There would have been a starting point for a stand-alone system. It is said it would have been too expensive and time consuming to finally develop it. Wagging tongues suggest that tasking the signal departments with PTC development and implementation was the end of the stand-alone system as it would make many signals surplus. Here is video about BNSF's PTC system: <a href="https://youtu.be/7fDRazEWAKU">https://youtu.be/7fDRazEWAKU</a> Regards, Volker
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