On the K-Line 21" cars - back and forth 3-2 and 2-3 is truly trivial, except that the wires for lights are too short when going 2-rail. If the converter used the K-Line trucks, you probably can just insert pizza cutter wheelsets. Best way is to find somebody with 3-rail cars who wants 2-rail cars, and trade parts. I have a friend with maybe a hundred such cars . . .
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