jis
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Yep. All reasonable conjectures. Now we await the facts from NTSB.I don't think it could be a failure of the control system. If the engineer was aware of where s/he was, and s/he tried to apply the brakes and they failed, then s/he would have known that. At that point s/he would have put the brake into emergency using the normal brake control handle. Failing that, there should have been another emergency brake valve in the cab. If that failed, s/he could have radioed the conductor to put the train into emergency from back in the train. Since the train would have needed to slow down well before the curve, an engineer who was aware of where the train was, and who was not disabled in some way, should have been able to have the brakes applied before they got to the curve.The lack of brake application indeed is a huge mystery. The event recorder actually records control inputs, so it is lack of control input that is the mystery. There is a chance it could be a failure of the control system. We'll just have to wait until NTSB completes its analysis.Situational awareness when it comes to trains means, to me, missing where you are located by a distance, which can happen, and results in things like 188 where the air is dumped too late for avoiding a derailment.Looking more and more like situational awareness. "Where am I?"Latest (12/20 morning) from NTSB says that no brake application was initiated at the approach to the curve. The first brake application happened automatically. So everyone is pretty puzzled about why.
This seems to me to be something else. The air was dumped automatically, as designed by Westinghouse over 100 years ago, when the attitude of the derailing train caused one of the brake lines to disconnect, engaging a fast dump protocol. That means nobody applied the brakes.
To me this means that either the engineer was non compis mentis, or the controls werent responding. Even if he had his head turned in conversation with the conductor trainee his peripheral vision should have picked up the turn at some point and he should have slammed the ebrake button. Even Sanchez at Chatsworth, who was texting, applied the brake uselessly at the last second.
I dont knoe how the voice recorder, if there is one, works, but one would at least expect an expletive.
jb