How do you avoid feeding power back into the auxiliary transformers through their secondaries? I love your idea with relays, but the conventional wisdom is to use resistors (if necessary, variable ones to fine-tune the resistance according to train load) to reduce voltage on the level and downgrade portions of the layout, leaving full track power for the ascending grade.
I'm not an EE so I'm not sure whether the resistors could also be controlled with relays. Would love to hear more about this, as well as some photos or videos of it in action! Thanks for sharing!!
