This project is fairly easy and simple to build making a nice layout which you can put up at the show without you being present there to constantly keep a control on.
Ho trains passing siding.
You are at the right place.
Make an oval loop with a passing siding somewhat as shown above.
The ordinary passing sidings are spaced 50mm a smidge under two inches.
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In an ideal world the passenger train holds the main and the other trains take siding of course.
That is or was prototypical by the way.
On my model railroad hoj 1 80 scale but slightly narrower than american ho i have some hidden tracks spaced 45mm 1 3 4 and a couple of those maybe in the same prefecture second tracks built later on a more favorable alignment.
Kato ho unitrack 3 112 hv2 passing siding track set with no.
In this case perhaps the op should be considering a single ended passing siding so the train being passed has to back out.
Marklin digital freight train starter set w passing siding mar29322.