Hmmm...it sounds like some people don't understand how a real railroad works. B units were not turned at each end of a run. There would be no advantage to do so. I don't know of many reversing loops either, on a real railroad, other than the Sunnyside yard loop in Queens, NY. There are probably a few others, but I doubt if they were designed for B units. I suppose that there may have been some WYE tracks that would accommodate an A unit and one or more B units, and I further suppose that the railroad might leave them all hooked up and turn the whole group.
If a B unit starts in California and ends up in Chicago, it probably goes back to California facing the same direction. "Correct" logo direction going East, "incorrect" logo direction going West.