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[quote user="jeffhergert"]And these automated devices, etc.  Who designs them? Who is involved in manufacturing the componets?  Who is involved in the installation and maintenance of such things?  But evidently many, maybe most, seem to think those involved in the above are somewhat more reliable than people who work out in the field.[/quote] For me it is not a question if PTC will fail some day but when, as with all man-made things. But that shouldn't be a reason not to install technical safety devices like e.g. PTC. The current signalling systems depends on the alertness of the engine crew, so any aspect enforcing system would have helped. Regards, Volker
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