NEW YORK (CBSNewYork) — Metro-North Railroad will soon evaluate all of its engineers for sleep apnea.

The move comes two weeks after a National Transportation Safety Board report revealed that the engineer in December’s deadly derailment has been diagnosed with severe sleep apnea.

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William Rockefeller told investigators that he felt dazed and mesmerized seconds before the crash.

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Four people were killed and dozens were injured when a Metro-North train flew off of the tracks in Spuyten Duyvil.

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