Thanks. I have 12 gauge busses for track power around 130 foot mains divided in 2 blocks each, and feeds to the busses from TIU are 12 or 14 gauge. I do have twisted pairs. I’m about to add 10 gauge feeds for at least one block, possibly two, because voltage drop is just an issue even when I think I had it covered, even with trains only drawing 5 amps or so max. It doesn’t take much V drop to slow a train with Pullmor or older-style motors, learned that years ago. Not all have “cruise control” to make it easy, esp the older style locos. TMCC works great and doesn’t care about capacitance.
I’m interpreting what has been posted on the forum to suggest that dividing the layout with more TIU channels might be a way to deal with the compromise, capacitance from necessary wire size and need for less of it to get good signal. Wrong track? Experiments with an oscilloscope for measurement of results (discussed elsewhere) to assess such questions are something I’d like to do.