My understanding from the engineers that have spoken on the issue is that the train continues to accelerate when the throttle is open.
http://wric.com/2015/05/14/retired-amtrak-engineer-talks-speed-challenges-of-job/
"Karl Edler, a retired engineer who drove the line hundreds of times, said an impact could help explain the wreck. When a train pulls out of the North Philadelphia station, the engineer usually twists the throttle “up to notch eight, which is engineer-speak for wide open” he said...
An engineer that used to travel this route was on MSNBC earlier. He indicated that it would be normal to be accelerating in that stretch. He noted what was missing what appeared to be missing was the normal process of applying the break leading up to the curve. Maybe he was distracted by the...
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