What you are describing is exactly how the glacier line is wired. The glacier line is basically a shelf railroad going around the outside of a basement with one Island. We also use the MTH power distribution blocks. It is only necessary to run one wire to each section. You may have a common ground. The best way to wire the layout is to get atlas selectors. If you don't know, and Atlas selector is a an electrical panel containing for spdt switches. You would run your wire from the power distribution block to the input of the selector. You would then run your first block on your selector to the first block on your layout. It is very wise to still divide your layout in two blocks. Because when you have an electrical issue, notice I did not say if, when you have an electrical issue you may simply put the selector switches in the center off position and then turn them on one at a time to determine where the electrical issue is. Also by dividing the layout into blocks you are able to turn on and off sidings. This is particularly helpful as last year I learned MTH engines Show run time if they are merely just sitting on the track and the track is powered. They do not have to be moving. I also learned you must have the power on when you initially turn your Transformers and tiu on so it may recognize the engines on the track. Then you may shut those blocks off so the engines aren't showing run time if that is of a concern to you. If you would like a greater detailed explanation I would be glad to give it to you but this is already way too long of a post.
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