here's your layout-fit the roadbed will be touching at the ends on the inner loop
Which track do you want to isolate with the 2 - 5" #40-1029 ?
Check the controller wires to the switch that is the problem child - don't screw it down tight-only the adjoining tracks and only snug to hold track- remove it and reinstall it - close the loop away from the offending switch and get easy track connection with the adjoining tracks first.
