It's a very short locomotive as are the cars, so O31 shouldn't be an issue. Mine runs fine on O36, but it's usually running on O72. I will say that the rear truck is a very hoaky design. I have wondered several times if just securing the two wheels solidly in the frame and losing those little pilot wheels would be a better option. Since the prototype only had two wheels in the rear, it should be a reasonable design.
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