As investigators try to decipher why the Amtrak train was traveling twice the suggested safe speed, some are questioning management decisions about engineer schedules, reports NBC New York.

“You need to be able to have some kind of chance to get off the equipment, turn your mind off for a while,” said Fritz Edler, a veteran engineer who wrote a scathing letter last December to Amtrak managers on behalf the Brotherhood of Locomotive Engineers and Trainmen.

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