A train that crashed on Sunday in New York City was going 82mph (132 km/h) in a 30mph zone when it ran off the rails, investigators have said.
Four people were killed and more than 60 injured in New York’s Bronx borough.
The Metro-North train from Poughkeepsie to New York City crashed about 07:20 local time (12:20 GMT) on a curve.
The National Transportation Safety Board (NTSB) is investigating whether a mechanical failure or human error caused the train’s high speed.
The train appeared to have been travelling over the speed limit even before it thundered into the curve where it crashed — the speed limit on the track approaching the curve is 70mph, NTSB board member Earl Weener said on Monday.
New York Senator Charles Schumer called the locomotive’s speed “frightening”.
“The fact that it was going 82mph even before the curve raises so many questions, and it’s scary,” Mr Schumer said, adding that the rail line’s tracks and signals appeared to have been in working order at the time of the accident.
Mr Weener said the train had made nine stops prior to the derailment, and officials had not yet uncovered any brake problems.
He said preliminary data from the train’s event recorders indicated the train’s brakes became fully engaged just five seconds before the locomotive came to a complete stop after the crash.
In addition, he said the locomotive’s throttle went to idle six seconds before the train came to a stop.
