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The ICC issued the speed limit of 79 mph for lines without ATS or ATC in the late 1940s affter the CB&Q's 1946 Naperville accident. The speed limit got mandatory in 1951. So crews were now running with a speed limit of 79 mph on routes where they had run at perhaps 90 mph or 100 mph before. These crews knew were speeding was possible without risk to make up time. Regards, Volker Edit: What I don't understand, how got ICC to 79 mph as speed limit without ATS or ATC. In Germany braking distance and signal spacing determine the speed limit. Standards signal spacing is about 3,300 ft. On lines with PZB (intermittent cab signalling and train protection system) the speed limit is 100 mph. Every train, passenger and freight, must be able to stop within 3,300 ft. For higher speeds LZB (contious train control) is required.
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