YONKERS - New information is shedding some troubling light on the Metro-North deadly derailment.

The derailment of a train at Spuyten Duyvil in the Bronx back in December brought safety concerns about the railroad to a head. Four people died, and a new report from the National Transportation Safety Board claims that William Rockefeller, the engineer during the fatal derailment, suffers from sleep apnea, which may have caused him to doze off while at the controls.

Rep. Patrick Maloney has called for the adoption of tougher standards for handling fatigue of on-duty train crews.

A Connecticut newspaper also says that federal inspectors found more than 7,000 defects and deficiencies over the past 10 years. Hearst Connecticut Media says regulators did not launch an investigation until last year.

Metro-North spokesperson Marjorie Anders says safety is the railroad's top priority, and it will assess all operational aspects going forward to ensure safety is a priority on every train.