Wow!
I have to start gowing to yard sales.
My layout is 5 X 30. My last lay out about 35 Yr. ago was 4 X8.
So I was not into the around the wall stuff. In my rush to something up and running I stuck with a big old double main oval. The ends of the oval go below grade and have passing tracks so I can put atrain into the tunnel, then put another in behind it , then take them out in any order. I want these two main line ovals to run 4 to 5 trains without operator intervention, hence the need for the computer control. The middle of the layout has a yard at one end and the other end has room for expantion.