As I understand it, the 10 is doing the honors. The 15 has been down for awhile (at least 2 years now). With the exception of the work done at the West Side & Cherry Valley enginehouse in '86 to prep it for the move to Fish Camp, I don't believe it's had any major rebuilding in more than 45 years. Anyhow, only one of the Shays would ever be steamed up at a given time (there's no point with the ability to really only operate one train), with the exception of a rare double-header over the years. They've also got the neat little Model A railtrucks which are quite a thrill...