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Hey John; How did you tunnel under the diosma? My effort is much simpler and as I said if i had of done the job properly in the first place it would have been no trouble at all. I used club rail which comes in 3.6 m lengths, but it does have a single joint inside it. I Used LGB joiners and soldering them and I can tell you no trouble at all. My tunnel is 1.88 m long and track is lafd on quarry fines ballast as straight as a die. I lined it with a 225 mm or 9" storm water pipe with walls abouy 4 mm thick. This sits directly on the ballast, an equal distance on either side of the sleepers (ties). I got what looks like six tent pegs and drove them into the ground positioning the pipe and holding it in place irrespecrtive of pressures from settling earth. I then built 2 Jigstones tunnel portals out of concrete ( cement) blocks which we cast using jifgstone moulds.. For your information the portals are made using a variation of the same set used for making all the spans for my viaduct. Really i am now confident i have done a good job and it will work ok for years. Rgds ian
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