at the same speed as every other train except for this one curve. the red dot shows 188 accelerating to 106 miles per hour. what do you read into that? >> well, it's inexplicable. the only thing i can speculate is that the -- that the engineer had a loss of situational awareness, meaning he didn't realizeidt realize exactly where he was. he may have thought he wass further on in the -- in the route than he was. i doubt that there was a -- a failure of the throttles. that's a very rare -- in the engine history of railway engines. so it's inexplicable. >> okay, peter, it is good to speak with you again. we appreciate your insights. thank you. >> thank you. >> eight people were killed, more than 200 injured in tuesday's crash. u.s. president barack obama offered condolences to the