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Well Scott I don't know much about this subject either I was hoping you would, that is why i logged in to this subject. I have had a few ideas and seen a few things at other peoples layouts. I had ideas of using a 250 mm (10") plastic water pipe, many real rail tunnels are nearly round. I saw an artle in the German Depetch (LGB) magazine and they used "U" shaped concrete moulding, with a matching paving stone on top. They put this all in a trench and filled dirt on top of it after getting the track in first of course. This looked beaut to me but I couldn't get the real guts on iy as i don't understand German. An important thing seems to be to have an acess chamber in the middle incase of a misshap. Hope this helps rgs Ian
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