[grobdriver]

The real question is “why was it speeding at that particular place?”

Studying Google Earth, we can see that there's a 2-mile stretch of track before the incident turn which has a 100 foot drop in elevation.

Inattentiveness (for whatever reason) and natural speed buildup.

[cuban leaf]

I suspect that is exactly it. If so, this will go very badly for that engineer.