I've never seen one. The problem with 3-rail wheel sets is that they were designed around supporting tubular track and sharp curves. They've had the wheel backs closer together than 2-rail wheelsets which is why they don't work smoothly on 2-rail turnouts. That back-to-back distance has been inconsistent over the past several decades as has been the wheel diameter, flange height, and wheel taper. Modernly, they're doing better. With the movement toward flat-top rail, I'd like to see the hi-rail wheel set changed to a Code 200 tread width, a .062 flange, an RP25 taper, and a back-to-back distance matching 2-rail wheel sets -- essentially an enlarged 2-rail wheel set (single-insulation optional). This would allow the wheels to traverse most 2-rail turnouts and crossings unmodified while supporting operation on current 3-rail turnouts and crossings.
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