I don't think so since the Lionel web page specifies minimum O-36 curves. On curves that tight, I think a fixed pilot would cause one derailment after another when coupled to anything with swinging couplers. I'm a big fan of fixed pilots but I'm willing to accept this concession knowing it makes the models usable by the widest possible audience. And no, I don't work for Lionel.
I pre-ordered a set of these today in PRR livery to replace my early-mid-2000s K-Line set. I take to heart all of the concerns about proper details per prototype practice, and I wholly agree that for the price, Lionel should get the details right, but...then I remember where the hobby was 20, 30 years ago and how, back then, I would traded my car for models like these.
Best wishes,
Joel