Thanks SteveH and GRJ! I never thought of about the accessories causing a problem. I'll be adding breakers to all the circuits on the layout. It looks like the Airpax breakers will perfect for my needs.
I'm really glad I ask about this before I started the wiring, this has the potential to save me a lot of problems in the future. Thanks again to the OGF, this really is the best resource for information on O gauge trains!