The National Transportation Safety Board (NTSB) determined that two commuter railroad terminal accidents in the New York area were caused by engineer fatigue resulting from undiagnosed severe obstructive sleep apnea.
The NTSB found the two accidents had "almost identical" probable causes and safety issues. The board also determined that these safety issues were not unique to these two properties, but exist throughout the country at many intercity passenger and commuter passenger train terminals.