Prewar Flyer 0 will run on Lionel track just fine. The Gilbert 0 track radius is the same as the postwar S radius. You can still find AF prewar 0 track on ebay or you could also use Lionel 042 track. Some guys get away with running the 3/16ths prewar stuff on normal Lionel 031 track but I've not always had good luck with that. Depends on the loco. I don't think the K5, Hudson, or the Challenger 4-8-4 like the 031 very much. Just my opinion though. Below are my 559 K5 and 531 Hudson both in 0.
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