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I think a good way to explain this is to insure the current that flows out
to the contacts on the Tortoise flows back to the same spot and takes the
same route. This is the best way to insure things like noise has the best
chance to cancel itself.

Now if the gnd at the AIU is internally part of the board is also tied to a
more system wide common should not change this. You want the current to
follow the same paths within a circuit and not some detour. I think of it
more like a balancing condition, you don't borrow electrons from somewhere
else, you keep each board using only the ones that passed through it, not
another board.

-Ken Cameron, Member JMRI Dev Team
www.jmri.org
www.fingerlakeslivesteamers.org
www.cnymod.org
www.syracusemodelrr.org