As others have said, the wire doesn't matter. I actually made a switch box so that I can switch a siding between operations to program track. It works out nicely.
Best!
Nothing wrong with using the 18g wire.
If you really wanted to, you could use that for your bus and the feeders.
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Jeff But it's a dry heat!
I have my zephyr with my bus wires connected, I have 18 gauge wire connected to the program track ports- question Do I connect the wire directly to the program tracks? or should I use a smaller gauge 22g from the tracks to the 18g?
Thanks
Art