Here's a video of the area:
https://www.youtube.com/watch?v=bfVUnQ4kMYc&t=900" onclick="window.open(this.href);return false;
15:00 - start of curve usually taken at 65 mph(turns right)
16:38 - derailment area, usually taken at 55 mph (turns left)
17:13 - start of curve usually taken at 55 mph (turns right)
What we know:
- The train accelerated out of that first curve up to ~106 mph (per public GPS data and NTSB)
- The windows were not penetrated by some foreign object
- Coming out of the first curve, the train accelerated as it normally would coming out of the next curve (per public GPS data of all 188 runs)
- The 1st and 3rd curve are both about 2-degrees of curvature (roughly calculated from map - first curve is compound)
- The two curves don't look drastically different during the day, but it was night during the accident. (See video, imagine less visibility)
I agree with Fishrrman: We appear to have a case of human error, which sucks for the passengers AND the engineer. The engineer is only human, and even the most attentive humans make mistakes. I'm kind of hoping that the NTSB finds some 'excuse' for his loss of attention, but I don't see anything being talked about that is credible.
Solutions?:
In terms of a second man in the cab, history shows this doesn't help in these cases. Intuitively, and from experience, the second man pays LESS attention than the operating engineer. To attempt to alleviate the second man being less attentive, NORAC requires that the second man 'call out' every signal. Unfortunately this rule doesn't seem to be followed. Other than road-foreman, I almost never see that happen.
There are numerous NTSB reports that indicate the inadequacy of a second man in the cab, which is part of the reason alerters are mandated. Even with alerters, it's been shown on (at least) two NTSB after-accident reports that the 'sleeping' crew continued to move the throttle.
This type of incident can really only be addressed by cab signal*, PTC or restriction-less track geometry. (*Contrary to a comment on the previous page, cab signal CAN enfore civil speed restrictions. This is done at numerous locations, including this exact curve west-bound.)