You can narrow the trucks, and that fixes the problem. Alas, I’ve never taken photos of the process, but you can safely lose about 3/16" between the wheels and the frames. This isn’t the best photo, but I think I shot this photo to show the difference in the spacing between frames and the wheels. The truck on the left has been “narrowed,” while the one on the right has not (or at least not completely) It’s been a while since I took these photos, and I forgot what I was trying to illustrate.

Here, you can see the narrowed trucks, with the wheels closer to the frame.

I’ve done this to all the “Connie” trucks that have crossed my workbench. I’ve not had one break (that I’ve heard of) yet. The key is that by narrowing the trucks, you end up screwing the sideframes into the “meat” of the bolster, which keeps them together. (I believe Dave Goodson simply used longer screws, but I’d defer to him for his actual technique.) I never liked the way the trucks were that much wider than the wheels, so I just started narrowing them from the first time I worked on one. (I suspect that the trucks on the tender of the prototype were 3’ gauge trucks, with 30" gauge wheels. When Bachmann did the model of the 30" prototype, I have a feeling they just made the trucks wider, preserving the “inset” of the wheels on the axle. Pure speculation on my part, but it makes sense.)
Later,
K