If I recall, you will be using FasTrack.
You can run a track power bus under the track. Many of the molded bays have notch. Those that don't, I cut one in with diagonal wire cutters. A cut on each side and bend the tab until it breaks off. I did this for my grandson's 4' x 8' loop.
He likes to crawl under the table. I didn't want wires under there. So, only two from the transformer near the edge and up through a hole.
Accessory wires, they're another story.
