of the locomotive cab, the center line, over here is where the engineer's windshield is. over here is the other windshield. and in the lower portion of the left-hand windshield, there's a circular pattern that emanates out just a bit. >> did something strike that amtrak train at the locomotive before it derailed? is that part of what happened here? the ntsb tonight saying they are looking at damage on the left side of the windshield. so that would be on the right side of your screen. they're describing this crew member's account, obtained just today in this interview, which says the train may have been hit by something, shortly before that crash. could that possibly explain what happened? again, the engineer says he remembers nothing in the moments leading up to the derailment itself. joining us now is fritz edler. mr. edler is a veteran amtrak engineer and a union officer from the brotherhood of locomotive engineers and trainmen, and he is someone who has operated this same model train.