As an alternative, depending on how many switches you were supplying power to, you could run that # 12 wire as a loop around the layout and feed the individual switches off of it. It would work the same way as feeding the track every four to six feet around the loop. Skinning a cat is not a precise science.
Keep in mind that the center wire from the controllers to the switches is redundant on common ground layouts and can be eliminated saving about 1/3 of your wire runs. Make the controller connections instead at a convenient common connection at the control panel, and, optionally for even further redundancy, make the center post connection at the switches to your nearby common/bus/loop.
This being the case, you can reduce your wire size yet again. I use 24-22 ga., whatever is convenient.
I would check with some of the Lionel parts dealers. I think they sell a flat 3 or 4 strand black wire that’s the same as the original Lionel.
I believe that wire is known as FB3 and FB4 respectively. But it's only #22 same as the original. T'stat wire is typically #18 and is better for runs longer than say 12 ft or so, depending on your supply power voltage. I use 16VDC on the layout for 022 switch power and it works pretty well. The power supply has an 80,000uF filter capacitor, so those babies snap very well!
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