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I guess I should have read all the other replies before I put MY 2 cents in. So, it IS going to be a curved tunnel. "Hmmm..", I think that if I were to build something like this, I would make the interior of the tunnel itself large enough to fit my big butt into, for maintenance, derailments, etc. Possibly using a "lift-away" portal, or access hatch from above. With a straight tunnel, it's easy enough to stick a 2X4 through one end to shove out derailed cars, but with a curved one, you will need to get into it yourself. <br /> If you have a big enough budget for this project, you might consider purchasing a "man-hole" from a local utility. If that is too much money, try bricking up an access hatch yourself and using a plate of steel on top. Either way, it sounds like a pretty big project. If you can get away with a straight tunnel, it will be much easier. As the folks said earlier, make sure you have a high point in the middle, otherwise the tunnel will flood when it rains. <br /> Hope this helps... Todd C.
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