The outside rails of a tubular track section are electrically connected through the ties. In order to make an insulated section, besides the the insulating track pins, you need to remove one of the outer rails and insulate it, by whatever means (I use middle rail fiber insulators from junk track), then re-install it to the crossties. Once you have done that you can use the fiber pins (modern ones are plastic) to create an insulated section.
Pete
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