RE: the F7s-- they had some parts removed before they arrived; also, one has a "internal engine water leak of unknown origin", and the other has a "bad lube oil cooler", both of these according to CDOT mechanical supervisors. They last ran in 1999 (6691) and early 2000 (6690). They came with no batteries or lube oil.
The B&M 1109 had leaking cylinder liner seals, resulting in water in the lube oil. "Making a milkshake" is what it's called, as that is what the lube oil looks like after the water/oil mix is emulsified by the lube oil pump. The first liner to leak was pulled and the seals and piston rings replaced. The old seals had the structural integrity of a rubber band left on a car dashboard for 2 years. The engine was cleaned internally, the oil was changed, the liner was reinstalled, and another one promptly leaked. At that point, it was realized that the other 5 liners would have to come out and be resealed. Then there is the low oil pressure situation, and the ride quality of the switcher trucks. Once 1109 moves to NAUG, it will eventually get some work done to enable it to operate for special days. It will not serve as a regular excursion train locomotive. Initially, it will be displayed at Thomaston station.
"You can't always get what you want, but if you try sometimes, you just might find you get what you need."