Cutting gaps in EZ-Track works very well. Even though I run DCC, I've cut gaps where I want to isolate my programming track from the rest of the layout yet still be able to run the engine onto the programm track under its own power. IIRC, the piece of styrene I needed to use was either .010" or .020" but may be different depending on the thickness of your cut-off disk. The way I did it, I cut a small piece of styrene of the correct thickness and glued it in the gap with CA glue. I let it dry overnight and then trimmed it with a #11 blade to match the profile of the rail. Hope this helps.