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For the one helix that I've still got in my track plan, I was thinking of starting with a piece of flat plywood and buiding the incline out of foam. I think it will be much easier to work with the foam to get a consistant grade out of it as well. The foam should also allow me to taper the start and end of the helix so it isn't such a drastic change for the train. One other though I had about not using plywood directly under the helix is that when I have the track go over itself, I can just use a HO scale bridge. I should be able to get one that is thinner than 1/2 inch plywood, therefore I don't need to have as steep of a grade in the helix. In other words, I only need 3.5 inches of rise instead of 4 like I would need with the plywood base. Thanks, Lance
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