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Ed, I did not mean to suggest that I had concluded that the engineer missed the signal and collided with the leading train because he was asleep.   As you and zugmann, I believe pointed out, he could have simply failed to see the standing train.  Was he authorized to pass the red signal and stay at restricted speed?  If so, the theory of sleeping past the red signal would not be needed to explain passing it.  So that just leaves the standing train as the requirement for action.  However, having said that, I don’t see how sleep could be ruled out by the timing of the final alerter and throttle resets.  He could have been sleeping between alerter resets, and become accustomed to falling asleep in a very short time after each reset.  If so, he could have reset the alerter; and seven seconds later, reset the throttle; and then slept for the next 1 minute 53 seconds until impact.  All we know for sure is that he was awake during the final alerter reset and final throttle change.
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