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Somewhere I read that the engineer dumped the air around 5-10 seconds before impact, so we know that he did realize he was going to hit before actual impact.  But we don't know what was happening just prior to that.  I understand that he has passed two signals without responding.  If the vision problem was off and on, the more signals he failed to respond to, the less probable it would be that he was experiencing a vision failure. Would the engineer know that he was meeting that opposing train by other communication?
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