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Hi Im currently landscaping part of my garden to change a waterfall. However I would like some time in the future have a garden railroad passing through a tunnell under the waterfall. What I would like to know is how wide and tall are tunnells expected to be. I will be making it oversize, and probably having some sort of face plate on the entrances. However as the Garden Railroad is a plan for the future I havent as yet any idea on what sort of dimensions I'm looking at.
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