The nation's second-busiest commuter railroad is no longer allowing engineers with sleep apnea to operate trains unless the condition is corrected or under control.
New Jersey Transit said it made the change last month after a deadly crash in which the engineer was later found to have sleep apnea.
Federal regulators are targeting the fatigue-inducing disorder this week with a new safety bulletin urging all railroads to screen engineers.
Metro-North, in the New York City suburbs, allows engineers with sleep apnea to keep operating trains as long as they're being treated.
That railroad started testing engineers after a deadly, sleep apnea-related crash in 2013. It found that 1 in 9 of its engineers suffers from sleep apnea.
Treatments for apnea include wearing a pressurized mask or oral appliances to force the airway open while sleeping.