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Yes phantom I do know how to do it but I would warn you that all the so called experts advise you not to do it. a) If your train gets caught in there you may not be able to get it out. b) Animals get in there and like to make it there own this includes snakes etc. And They are hard to get right to start with. What I did was to get 250 mm (10") ID plastic water pipeof more than the correct length. Make a template out of cardboard using your track as a guide, and then convert this into a wooden base for your track (Use marine ply if you can afford it) and test that your curve fits correctly and is longer than the tunnel to allow quick release connections. Then get in touch with I think it is Hillman clamps they have joiners that make the whole thing relatively removable. Then with your origonal template or even using your mounting board as a template cut even "V" shaped sections out of what will be the inside of your curved tunnel and bend the pipe to suit your template easily and steadily untill you have it so that your wooden baseboard will slide into your tunnel. Elevated temperatures will help you in this activity ie a very hot day (40 deg C +) and using a very low temperature oven if you have one big enough; failing this run a gas jet up and down it from time to time very gently. Now when it all looks pretty good you will probably have to throw it away and start again as you have stuffed it up somewhere or other and it will look a mess and not be as water tight as you would like; your second or third attempt should be pretty good. Coat the whole thing with a thick water tight paint type stuff. You then use a hand made compass out of pegs and string and draw your curve on the ground where you want it and dig the required trench. Put your entire sction into the trench; get everything working before you fill it in. In theory 1m (40") is about as long as you should go but if you are adventurous up to 2m (80") could be attempted. Good luck. Ian; Kawana Island Tropical Railway.
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