By the way, this photo was for a Lionel project involving deteriorating zinc castings. The lower frame is the Wolfer/Duddy/Stevenson frame (still available) and the upper is the Lionel. As far as I can tell, the Wolfer frame is the most accurate ever done in O Scale, and I would bet that includes Kohs. Three of my GG1s are equipped with these frames, and only a couple have the earlier Alexander trucks.
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