All 027 on my layout (a little FT too). I used black floral gravel that I found at a local dollar store. Probably a little big but if I was that concerned about the scale then I wouldn't be using tubular track. At a buck for a one pound bag who's gonna complain.
The light gray and brown gravels are also a floral decorating product from Michael's.
I thought about adding extra ties but I know this layout will get torn down eventually for a bigger one so it wasn't worth the time and effort. The next one will be GG and Ross switches.
My Layout is O-31 Tubular track. I add basswood wood ties, 1/2"x1/4" 2-1/4" Long, painted black. My ballast is gravel from Ant Hills. Here in Western Colorado we have these large Ant Hills, 2-3 feet in diameter. The ants are great sorters and bring up these large grains of sand, small pebbles. I scoop this material up into a bucket, bring it home and run it through a sifter. When I lay my track I insert the wood ties, the pour over the ballast, dress it up with a brush. I use tweezers to pick out the oversized pieces and other junk. Then Spray with an alcohol water mix, then using a medicine dropper, add white glue water mix.
The Ground Cover you see is a fine sand I dug up out of a creek bed, Dry it out and run through a kitchen sifter.
I have O 31 tubular, and I don't ballast between the rails. I have rubber ties to fill in the gaps between the metal ties, and I use chicken grit for areas adjacent to the rails. No need for glue, wet water, or anything else, and that works for me.
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