I remember being told (or reading) decades ago that you run the dummy ahead of the powered unit, in A -A configurations, but I don't recall why. I do it occasionally with my F units, at least, including my original 2353 Santa Fe units. A practical reason with my 2353s is that the powered unit was involved with so many "grade crossing accidents" and was (mis)handled so much (by me as a kid) that the dummy unit is in much better shape cosmetically, and it just "looks better".
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