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I looked at this when there were 36 items, and no one answred your question. I think that as the emergency application took hold the retarding force of the wheels slowing had the effect of pulling the track in the direction that the train was moving. If that force was sufficient to move the track it would certainly make the kink worse, since it is the weak spot in the track. I have a vague recollection of a freight train derailment where a similar pattern occurred. The answer could be much less exotic however. What cars got over it and which one derailed first? Consider truck wheelbase, truck flexibility, distance between truck centers, stiffness of drawbars moving side to side. Also, while NTSB is good technically, they do not always come up with an answer and they are not always right. They are a political outfit remember. The accordian pattern is typical of derailments in general and is due to the fact that cars plowing dirt are going to stop a lot faster than those still on the rail.
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