S scale is about 3/4 the size of O scale. The track gauge (width) is much narrower. And traditional O scale 2 rail is really scaled to 5 feet instead of 4 feet 8 1/2 inches. So typical O scale track is even wider than expected.
AF made three rail 0 gauge track before WWII, I do not know if they made 2 rail 0 gauge.
S gauge and 0 gauge, as said, are two different widths of rail separation gauges. However that was not your question.
Instead of S scale you used the term American Flyer, AF made 2 rail HO trains in the 50's. Those early 2 rail AF trains will run on today's 0 scale 0n30 narrow gauge track. (Only shared to muddy the water)
Here's the original question: Will O scale 2-rail to day run, on American Flyer 2-railtrack?
Hate to break the news to you, but HO has NOTHING to do with the question above. The question is about modern O scale 2 rail. Will it run of AF 2 rail track.
I think AF made 2-rail O-gauge track for its O-gauge trains sold pre WW2, in which case O-scale 5-W (1-1/4") might run on some sections, but probably not through switches. It would be similar to Gargraves 2-rail O-gauge, which would also have the switch problem (wheel tread too narrow, etc.).
Actually, there's listing on e-Bay for what is said to be AF 2-rail O-gauge track (banked curves). They're only 27" radius, so that severely limits the O-Scale equipment that could operate through them.
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