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[quote user="Euclid"] This was probably possible 15 years ago and only a tiny project compared to PTC.[/quote] Intermittent train protection systems are in serve since the 1930s. It started with the Indusi system. With edition I60R in the 1980s it was able to deliver the protection you ask for. Not continously controlled by a computer but initiated by trackside inductors/antennas:  <a href="https://en.wikipedia.org/wiki/Punktf%C3%B6rmige_Zugbeeinflussung">https://en.wikipedia.org/wiki/Punktf%C3%B6rmige_Zugbeeinflussung</a> Regard, Volker
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