UPDATE: Investigators say the train that derailed was going at a speed of 82mph as it entered a 30 mph curve.
Investigators are trying to figure out what caused a commuter train to derail in New York City on Sunday, killing four people and injuring more than 60.
FOX News Radio's Jeff Monosso reports from the Bronx:
Dozens of people are still recovering this morning, some in critical condition following the deadly crash that's left a mangled mess here of twisted train cars. And as federal investigators look for a cause, Governor Andrew Cuomo telling us:
(Cuomo) "It was about speed. The question is going to be why was the train speeding."
The train's engineer also reportedly told investigators that his breaks didn't work as he approached this curve. The train station remains closed, likely for days leaving thousands of New Yorkers to find a different way to work.
In the Bronx, Jeff Monosso, FOX News Radio.
WATCH for more on this story: