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[quote]QUOTE: Originally posted by cbq9911a Building some fairly elaborate scenery above hidden trackage - and allowing 1/2" less clearance than necessary. [/quote] I did something similar. To keep grades as low as possible on my small layout, I cut every bit of elevation as possible. In two tunnels, where one track passes below another, I cut a "slot" in the 1/2" homasote roadbed. This saved me 1/2" out of 2 1/2" of elevation. The upper track easily supported itself across the narrow "slot", so I simply installed sheet balsa wood to hold ballast and ground cover. Well, in one tunnel, when I installed ballast (using wet-water and diluted white glue), the balsa wood warped into a shallow "U" shape, decreasing the height of the tunnel ceiling enough that my piggy-back cars get wedged in that particular tunnel now (everything else runs fine through there). I could have simply used sheet brass, and it would have been fine. Piggyback traffic is now re-routed on my layout. ---jps
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