How do you do it? To control an accessory that goes on when the train goes by, and then cuts out, like a crossing gate. I bought a Lionel Fastrack "insulated track" thinking it would be the same as the old style insulated tracks. Uh-uh. It has metal pins everywhere the regular straights do. The only difference I can see is the label underneath saying "insulated".
I worked around it by cutting off a pin on it and the next section, then inserting cardboard between. It's not elegant, but it works.