Bob Nelson
The dimensions will depend a lot on what equipment you run. Big steamers and 18 inch passenger cars will make it around 042 curves but overhang quite a bit, while the smaller 027 style equipment will make it through narrower spaces. Everytime I thought I had clearances figured out on my layout I got a new engine and had to chip away at some rock walls!
The best thing to do is to run your own experiments with your biggest equipment and go from there.
Jim Policastro
Modeling the "Fargo Area Rapid Transit" in O scale 3 rail.
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