Detailed Instructions: Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.
Q: Sentence: Some of the roughly 150 passengers on the early morning Metro - North train from Poughkeepsie to Manhattan were jolted from sleep around 7 : 20 a . m . to screams and the frightening sensation of their compartment rolling over on a bend in the Bronx where the Hudson and Harlem rivers meet .<sep>Span: compartment rolling over on a bend in the
A:
What exactly made the train flip? Was this a particularly fast turn?