radio transmissions from the night and found nothing to suggest that. new information from the train's black box. evidence suggests that he manually pushed the throttle forward manually, that could have caused the deadly acceleration. >> let's discuss all of this with miles o'brian, cnn's transportation analyst. david susy is also with us. david, i want to talk about this notion of a projectile hitting the train's windshield. there were reports that there were other trains in the area that were hit by some sort of projectile. is that even possible as a cause of this crash given what you know? >> i'm not seeing a correlation between the two. the only possibility is that it was a distraction at the wrong time. he had time to think about this.