From the shininess and “feel” of the plastic, I too assumed that these are made of delrin .042 is a standard curve diameter reference in three rail and, yes, it’s 21” radius. The wheels on all of these cars are tinplate, not scale. But the trucks don’t seem to hold together very well, hence the desire to replace them. The couplers thumbtack. I also have one curve that is 036, so 40 foot cars with body mounted couplers probably won’t work. But thanks for the thoughts.
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