CW-80's wouldn't be my first choice but they will work just fine for what you're doing.
The idea is to leave the ground or outside rails tied together as usual. The center rail needs to be isolated/electrically insulated to create two circuits. How you do that depends on the track system. For old school tubular track you yank out a center pin and use a plastic pin. For mth real track you tape over the connector under the rails. Gargraves you cut the center rail to make a gap. Not sure how you do this with lionel fast track.
I am sure someone can point you in the right direction if Google doesn't help.
Amazed by your progress so far. Those cuts look perfect. Did you have those cut on a water jet table?
