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[quote user="243129"] Amtrak’s 30-plus-year-old AEM7 locomotives with Amfleet coaches and an experienced engineer, were they allowed, could equal Acela Express running time as did the Metroliners of 1969.[/quote] I have a question about the circumstances and if one can really compares apples with apples. Possible travel times are not only dependend on safe curve speed alone but more so on speed limited by allowed lateral acceleration for passengers. What was the allowed lateral acceleration for passenger cars in 1969? The Acela is limited to a lateral acceleration for passengers of 0.1g. FRA increased the lateral acceleration to 0.15g in 2013 (49 CFR 213.57 (d)(2)(ii). Regards, Volker
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