Maybe we are are talking about different engines. The O gauge brass hybrid was not a big seller, today some potential purchasers may be regretting they passed on it. The 2022 Big Book O gauge Vision Line steamers have some separately applied parts but they are diecast engines at $2,100. They are also O72 minimum diameter. In S gauge that would be 27"R equivalent. If Lionel cataloged a $2,100 engine with high rail wheels and a 27" minimum radius I bet they would get less than 100 orders, so it would not be made.
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