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[quote user="SAMUEL C WALKER"]Had a Talgo designed locomotive been pulliing the 501, might the operational mistake been lessened?[/quote] The tilting systems are used for passenger comfort. The tipping speed is a lot higher then the for comfort restricted speed. The tilting lessens the lateral acceleration and force when entering a curve. That makes higher curve speeds possible without exceeding the passenger comfort limits. Locomotives for tilting trains usually don't have a tilting mechanism (Acela Express) as the physics are not different and the locomotive engineer can stand the higher lateral acceleration. Talgo says their system allows up to 25% higher curve speeds. That would have been 7.5 mph for Atk 501.  No, the train would have derailed anyway at 79 mph. Regards, Volker
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