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TIA, <br /> <br /> It sounds like you may be modeling outdoor "G" scale, but anyway, my suggestion, even though I model HO scale, would be to trench through the area you want the tunnel to be in, lay the road bed and track, cover the track with flexable conduit or drainage line to protect the track from caveins then cover over the conduit with dirt and hope vermin don't take up residence. <br /> <br />Ken, D&J Railroad, Stafford, VA
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