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All this talk of T-trak is making me want to build a simple one for the national train show in July.
Below grade isn't a problem. You just have to plan.And use 1x2s instead of 1x3s. That gives you an inch.Otherwise, use 3/4" MDF as a flat base. I'm doing that for my some of my MPA stuff to get enough clearance.
That's kind of overkill, isn't it? 3/4" MDF not only doesn't take well to moisture, i.e., scenery materials, but it's heavy. Maybe that's not a concern in a standard module, but build larger modules, like a double, triple, or quadruple, to do up something like Fredericksburg correctly, and you're losing portability.DFF
You could use 1/4" luaun plywood and 1/2" foam?
Kato does have a set of automatic crossing gates (expandable to two tracks) for use at the grade crossing: