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Also wondering about all those double-crossovers; they are quite rare in real life. A bit cheaper and more proto to use pairs of opposing single crossovers.
I was thinking about that too but 4 #10 switches in row take up a lot more space.
The yard is a pretty dominant feature of the current plan, while the mainline run is relatively short (unless you count multiple laps of continuous running). This strikes me as a terminal type plan where a through train appears from staging and fairly quickly enters the yard, then re-enters staging fairly quickly thereafter. There is nothing wrong with that, but it is something to consider. I would be tempted to scale the visible yard back a bit and work in a longer mainline run, but that may not be best for you.
Gary It isn’t really a Helix. It is only one turn then will run under the layout down to about 4” under the yard and then back up.