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[quote user="anb740"] From this point, the speculation begins. What happened to the crew on the Z-train. Why did the alerter in the lead unit not kick in and stop the train; it's designed to do just that after 15-20 seconds if the engineer doesn't do something to the controls or push the alerter cancel button. (which will go off again after another 15-20 seconds of inactivity)   Maybe one of these days, PTC or some other technology will prevent this from happening again. <div style="clear:both;"></div> [/quote]   Better alerter technology might prevent this from happening again too. In the thread called, Deadly Sleep Disorders 2.0, I linked a report on locomotive alerter technology.  It covered something called “alerter naps” where it has been demonstrated that engineers can reset the alerter while sleeping, or so close to sleeping that they are oblivious to what is happening around them.  Because resetting the alerter is so repetitive and so reflexive, it can be done while being nearly completely asleep.
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