Train Nut posted:No idea why it wasn't continued. I wish it was because that's all I would have! I know they didn't make any bigger radius than O31. And some people said the thin rail made grooves in the rollers which I don't really think was that big an issue. Not enough to discontinue such an awesome looking track.
To my understanding that was from a softer metal that Lionel began using for the rollers. When that problem was discovered they went back to a harder metal, fixing the problem.
Bill