I reworked this yard last summer and it now has this configuration:
That's the mainline in the background. As you can see, I was able to elongate one of the sidings, and eliminated the reverse siding that was impossible to use.
While this terminal (lets not call it a yard) works OK for the majority of my needs, it quickly is overwhelmed:
That day I had an open house, and had to build a bigger storage yard with temporary tracks. Starting at the beverage service siding, I added temporary tracks under the mainline and in to the major part of the grass. These photos show you how it crossed under the main and how we did the trackage:
This shows how the beverage trackage ends (a few years ago, but I haven't changed it all that much. Note the mainline in the background was lifted about 12-15 inches from where it is pictured)
Ducking under the mainline (note how much higher it is than when pictured above!)
Russ is 0-5-0'ing some cars down in to the yard. If you look carefully, you can see where the beverage service trackage ends and this temporary yard started. We had a wicked curve under the bridge, and if this ever became a real yard, it would be a lot gentler.
After the tracks turned, they continued for a while
I hope this shows you how you may plan your yard one way, but when you get down to operating it, you may find it needs to be moved or adjusted!!