The immediate probable cause of the Bronx derailment centered on train engineer William Rockefeller, who fell asleep at the controls as the early morning train neared a dangerous curve, the NTSB said. As a result, the train was traveling at 82 mph as it hit the curve near the Spuyten Duyvil Station, where the speed limit is 30 mph. In addition to the four deaths, at least 61 passengers were injured.