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Hello, I jumped into this, because of your comment that the tunnel will be 6 to 8 feet long. Most Garden Railroaders will tell you to NOT make your tunnel longer than you can reach into it! If your train is going to derail anywhere, you can bet it will be inside the tunnel! If the tunnel absolutely must be 6 to 8 feet long, I would split it into 2 shorter tunnels with a distance between that would allow you to get at either tunnel from either end. <br />The skinny cement blocks could be stood on edge and made to go around a curve, I used them on a straight tunnel and covered the top with a piece of exterior grade 3/4 inch plywood which I sealed and painted before installation. The tunnel was in a reasonoably dry area of the railway and the plywood lasted over 5 years. <br /> <br />Hope this helps, Rich
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