The three-rail units were designed to negotiate O-31 curves (15.5" radius)--O-42 (21" radius) on the longer diesels. They had a bevel cut on the inboard wheel sides to allow the wheel to drop on the outside rail and ride back up onto the rail on straight track. There were no springs as this would fight re-railing. If you wanted to flange that axle, you'd restrict the curves to something around O-54 minimum (27" radius) or larger off the top of my head. You'd also need to fix them in place or add stiff springs to prevent climbing/derailing in curves.
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