memorized. to think that a stone hitting or something distracted him that he would have hit that forward, there's a lot of safe guards that go in place as far as the training that go into this. although they can be improved as we talk about with the positive train controls as well. >> but where were they? we know he pulled brake just seconds before it hit that current and derailing. it took some time obviously to get up to the speed that it was unsafe before they got to 100 miles per hour? >> it did. there was obviously some kind of disconnect, whether it was in his mind, from the stone from whatever happened or if there was a literal mechanical disconnect between the throttles and what was going on with that engine. these are electric locomotive, we're talk about a rheostat. that comes through.