In New York, investigators say a train that derailed in the Bronx Sunday was traveling at nearly three times the allowed speed when it headed into a curve before leaving the track. Four people died, and dozens more were injured, marking New York City’s deadliest train derailment in more than two decades. A National Transportation Safety Board member said Monday it is still unclear if the crash stemmed from human error or an equipment failure.

Earl Weener: “The preliminary information, and let me emphasize this is preliminary information, from the event recorders shows that the train was traveling at approximately 82 miles per hour as it went into a 30-mile-an-hour curve. That speed again was 82 miles an hour at the entrance to a 30-mile-an-hour curve.”