Yes, on the test track things behave normally. What changed for the layout was from 2 track circuits with about 20 feet each of 14 gauge wire on the common side between transformer and 2 TIU inputs, to 4 circuits (two newly connected) with about 20 feet each of 12 gauge wire on common side transformer to TIU. So as you experts point out, some added capacitative load for the signal compared to before, but this still is not close to the mass of copper wire on the common side of some of the truly huge layouts where things work, especially with your buffer added as here.
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