If I'm correct, I heard from my local TV news station that U.P. #4466 from the Calif. State Railroad Mueseum will back pulling excursions in a few months or sooner! Three cheers for 4466!
Other than that, I would have to say that if anyone is lucky enough to get to ride in one of those excursions, I would encourage them to take plenty of pictures, and then post them here, in the appropriate forum of course.