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[quote user="Euclid"]What I want to know is how many feet it would take to stop from an application at 80 mph for each type of application. [/quote] I think that can't be calculated from the Talgo specs. We don't know the brake decelerations at 80 mph. The given data seems to be the absolute maximum and is not constant over the speed range. We know the propagation rates (about 540 ft/sec and 930 ft/sec) but we don't know the time from trigerring the car brake until the brakes are fully applied. Perhaps a quote from the PRIIA Bilevel Passenger Rail Car, Chapter 7 Brakes specs gives some more information though it doesn't make it easier: A train consisting of five bi-level cars built to this specification (in any combination of car types) and one F59 locomotive (or equivalent) shall have a minimum full service braking rate of 1.35miles per hour per second (mphps) at 125 mph increasing to and maintaining an average of 2.00 mphps at speeds of 70 mph or less. The instantaneous full service deceleration rate shall not exceed 2.75 mphps nor be less than 1.25 mphps. The emergency brake rate shall not be less than 2.50 mphps at speeds below 70 mph. The cars shall be loaded to AW2 condition. The Contractor shall verify that the brakes are fully functional under all operating and environmental conditions found in PRIIA Specification 305-912. Locomotive dynamic braking shall not be used to determine compliance with specified brake rates. Regards, Volker
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