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It is possible that on a rare occasion for some reason a diesel engine was running. However, one observation does not make a good basis for a general statement that they have their diesel engines running. I was merely stating what the general practice is, and one observation to the contrary does not change that. Indeed on rare occasions with special permission from higher up muckitty-muck, there have been cases when a diesel engine operated through or in Penn station with its prime mover on. But also be aware that a P32ACDM can sound surprisingly like its diesel engine is running when it is on e-mode with its diesel engine off.bratkinson said:Not to disagree with the previous respondents, but at age 71, I DO know the sound of an idling diesel when I hear it! Even through the window of a roomette. If not that dual mode, maybe an NJT unit?