@BNSF-Matt posted:Keep in mind that I have never seen Lionel use O48 as a minimum requirement on anything. Perhaps because it's a unique fastback size and not tubular.
So if it doesn't clear O36 cleanly then does Lionel auto stamp it with O54? I don't know and really only Lionel can answer that question.
Lionel should just get rid of the O-54 designation and use Fastrack curves to designate turn radius.