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I've slowed down the recording of that chugging engine, and here is what I was able to hear there is a repeating period of 8 beats, and one of those beats is so loud that it makes the whole engine sound like it's the only cylinder that's firing.   It goes like this 1 2 3 4 5 6 7 8   the big 5 is the sound you hear at normal speed of the sound file.  It's so dominant that you can't even hear the other beats unless you show down the recording and increase volume in an editing program.  I guess this proves what Don was saying. This can only be a dominant engine.  But I think the alternate explanation is a hole on the exhaust manifold of one of the cylinders Now that I think about it. I've heard some buses that sounded like that. But that was a manifold rapture, at least I think it was. Could be the same injector misadjustment though as on these locomotives.   By the way, how do you call such a phenomenon?  I tried googling for "dominant cylinder" or similar phrases but found little results. There must be a common technical term for such a thing
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