Actually it is not a Southwest Forest Industries Locomotive, it is from the Saginaw and Manistee lumber railroad that ran southwest out of Flagstaff down to Happy Jack if I remember right. The 12 used to sit out at Fort Tuthill (fairgrounds) along the old ROW and was cared for in part by the railroad club that had one of the buildings for a large layout.
The 2 spot (now numbered 25) (if I remember right is a 2-6-0) is also in Flagstaff as well, located (When I lived there) down by the sawmill on the southside of town. I think that the Saginaw and Manistee was absorbed by Southwest Forest Industries. When I lived there you could find the ROW pretty easily, but I doubt if it is as easy to find now. The tracks were ripped out in the late 1960's