I believe they keep 844 and 4014 inside the shop complex which is somewhat across from the roundhouse. It would be sad to see the roundhouse torn down, but who knows. You guess is as good as mine. Steam in this era is an ever changing evolution mostly dominated by economic and company heads scenarios at the time. Stuff on mainlines have come and gone over the years since the steam era ended. My suggestion is to get out and see the stuff you want to see ASAP, before something changes for the worse. It usually does eventually.
Greg