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I reposted the decelerations trying to base the discussion, why the engineer said/concluded full service and emergency application have the same effect, on some data. The Talgo Series 8 differs from other trains that it is quite short, 672 ft without locomotive, and has disk brakes on all wheels but not unusual for passenger cars. I found information about brake propagation rates in two different sources. - Service application: 50 ft in 0.1 sec = 500 ft sec - Emergency application: 950 ft/ sec (from NTSB report) How true I don't know. I think the Talgo brake data are correct for all brakes applied only. Regards, Volker
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