Thomas Gallagher’s diagnosis echoed an earlier Metro-North Railroad crash in 2013, in which the engineer was found to have undiagnosed sleep apnea, reports The New York Times.

On Wednesday evening, the Federal Railroad Administration said it would soon issue a safety advisory to push railroads to tackle worker fatigue and to install cameras in locomotives. Officials have “long believed it is important for railroads to address worker fatigue more aggressively,” Matthew Lehner, a spokesman for the railroad administration, said.