The shorter boiler is from #152, a Class 45 2-6-0 built by BLW in 1881 (#5675). Originally named the "Durango" it was the D&RG'w last attempt at using 2-6-0's on the narrow gauge. It had 45" drivers,14X20 cylinders, 9560#s of TE. It was scrapped in 1899.
The longer boiler is off either a Class 56 or 60 (not sure). On the other side of the wall is the smokebox door (the original BLW door.) To my knowledge no one has determined its origin. I think the BLW number should be stamped on the steam dome.
Both boilers are wrought iron lap seam construction. In their shop service, they probably carried about 50-75 lbs of steam. I doubt they are good for 1/2 that today. Both fireboxes have beautiful examples of corrugated crownsheets.