Well, I think the larger AF S locos will need the larger radius although that is mostly based on experience trying to get the prewar AF 0 to run on Lionel 031 curves. You may be able to get away with it using 036. You would have to check, but American models or another of the recent S mfrs may have made 036 track, but I really do not know. Worth a check though. I'm guessing you want to end up with a loop of 0 and a loop of S? Do some track homework, there are some options out there that should let you come up with a combination that you like.
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