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[quote]QUOTE: Originally posted by d4fal Depending upon scale, of course, and how big you want this tunnel, the most important part is how the portals look and the functionality of the lining that no one should be able to see anyway. As long as it supports the load above the tunnel, almost anything would do. Temporary tunnels could be mocked up with plywood covered in plastic then overlaid with the dirt covering. Once this is done, and you decided that you like the placement, clearance, etc., you could consider a more permanent structure. In my scale, that is a formidable project, but in G-scale it could be done in pressure treated lumber, and depending upon budget and how long you plan on keeping the tunnel there, you could use a water proof liner and exterior grade plywood. Doubt concrete is really called for in this scale. Seen timber type construction done with treated boards, but that is frowned on in a garden where the treated wood could harm your plants. [/quote] Can treated wood harm plants? My tracks are screwed down to pressure treated wood and plants are around it. It has been a year and no plants have been harmed by the wood. Are the plants going to die later on?
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