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Mark: Following up on the posts above, the minimum radius you want will depend largely on what era you are modeling and thus what size motive power and rollingstock you want to run. Early in the last century most freight cars were in the 36-40 foot class, most motive power of the four or six coupled variety, thus you can use smaller radius curves. Late in the steam era motive power became much larger as did passenger car lengths, thus you will require larger curves. Also there is the issue of "look". Most larger rollingstock will actually operate on smaller radius curves but will "look" out of scale and pinched due to overhang. My advice to you is to follow the MNRA standards closely, you will have less operational trouble and be happier with your layout appearance. Good Luck Randy
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