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Hi Matt, I never saw any need to model a full tunnel liner either as the whole thing would not be seen. What I have used for a liner is a piece of crumpled extra wide heavy duty aluminum foil about 6-8 inches long spray painted flat black. Paint the foil after you have crumpled it and straightened it back out. Then bend it into a U shape and staple the sides to the subroadbed. When viewed from the tunnel portals it looks like rock. As for a "safety net" how about a strip of 1 inch lattice tacked to each side of the sub roadbed. That should be high enough to stop anything from falling in the event of a derailment. Just some ideas....Take Care and Have Fun...Vic
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