My layout is U shaped to get long runs and center access. About 7’ x 7’ of one end is covered by the upper level. The main loops under that section and the line going up to it loops on top and goes back to the trestles on a 2’ side elevated section with the three houses on it. I hav 3 storage sidings under each elevated section, plus real estate on top to develop. The lower line can enter or exit 3 tunnels before the “river”. I used concrete wall forms for support. They are 6” and should be 7”. Double stacks are very close running under.
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