Maybe the engineer tried to brake to late? If you have ever pulled a trailer it tends to keep moving even you want to stop. Looks like too fast on the curve and too late to slow down.
Centrifugal force does not discriminate nor angular velocity. Take your pick to parse.
7.7 m/s2 or close to 0.8 g, seems incredible. Did I make a mistake? The location is from a Google News link to the NYT.