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I think your most important question is how to make sure your tunnel doesn't fill up with water. Set it up so that there are no low points in the tunnel and that the roadbed is free draining so water will easily run out of the tunnel. I would probably dig a trench and lay a half section of PVC or something in the bottom. Then fill the PVC with coarse sand to fine gravel. Put a thin cinder block on each side of this and cover with another half section of PVC pipe. Then backfill the portion outside the cinder blocks with sand. If the tunnel has a grade of a half percent, and you take these kinds of precautions against poor drainage, the tunnel will probably work fine for a very long time. Good Luck. Funny thing about G scale, sometimes you have to build it like the real thing cause you are fighting the elements. Not like us indoor guys. - Ed
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