Having read about the Cheyenne Steam Shop tour given by Lynn Nystrom, has Steve Lee retired? He's close to the right age if not slightly past.

Not to the best of my knowledge, which was current as of three weeks ago.

I think it's safe to say that we would have heard by now if he had retired; he's not going to do so without someone in the railfan community finding out about it, and probably a lot sooner than one might think.