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[quote user="charlie hebdo"]But with HSR and even conventional fast trains, even good signs and landmarks are easily overlooked. Volker Landwehr should be able to tell us what method is used on Deutsche Bahn.[/quote] I'll try but I'm not too familiar with the German signaling system. What I can say is: Distance between main signals is between 2,300 ft and 4,300 ft depending on speed. An approach signal is located between two main signals in the braking distance, mostly 3,300 ft, to the following main signal and shows its aspect and when necessary a speed restriction sign. That works up to 100 mph. For faster trains LZB was developed as the distance between approach and main signal was shorter than the braking distance: <a href="https://en.wikipedia.org/wiki/Linienzugbeeinflussung">https://en.wikipedia.org/wiki/Linienzugbeeinflussung</a> This allows the engineer to "see" signals up to 8 miles ahead. LZB is a kind of PTC with a bit different capability. Regards, Volker
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