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Glen; <br /> <br />It is not like me to quote from the bible or to mention parables but you remember the one about the man and his son taking their donkey to market, ie please yourself and you please every one. <br /> <br />I have just finished my "Vampires Tunnel" and it works wonderfully, looks terrific and was easy to build, i only run LGB at 22.5 : 1 so that is all i allowed for; any one else can worry about their own problems. <br /> <br />I have used 225 mm say 9" storm water pipe and with the portals at each end i have made them out of Jigstones parts that I also bought for my viaduct spans, the whole thing is a working, workmanlike project of which i am proud. <br /> <br />Hpwever if what Vic says is correct and I 'm sure that it is; try adding 20 % to what I have done eg 225 X 1.2 = 270 mm pipe or 11" or you may have to go to 300 mm or a foot. dia. It will be double the price and will look grosse and unecessary if you are not going to go that way tyourself. If your friend wants to give his stuff a run on your tracks let him bring around something to suit your track. <br /> <br />You can only run LGB MTS trains on a lot of my layout, particularly the reversing loops; so I just tell people in advance they can either bring something that will suit the local <br />conditions or just come yourself and enjoy the companionship. <br /> <br />If you would like to see the tunnel as it is and how it was; send me your email address and i willsend you some pics <br /> <br /> <br />Rgds <br /> <br />Ian
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