Long time since last post here but wanted to post the solution. V drop turns out to be within most power supplies, including Z4000 and other very large ones including the old Mainline Industries “industrial” sized transformer I have, and that giant box-sized dual transformer whose name I’ve temporarily forgotten kindly tested for me by Berwyn’s Toys and Trains when they had one for sale. 3-4 volt drop at the output posts under a normal train load for all. This internal resistance must relate to some common characteristic of the internals of most AC transformers. BUT Lionel bricks turn out to have only about a 1V drop under same load, so they (two in parallel each for good measure) power districts that have 12-14 ga wire and 15A breaker. Pride Lines TMCC conversion now functions with minimal speed variation at safe voltage.
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