40 years ago I photographed a sister of this engine at the Elmhurst Chicago Stone quarry in Elmhurst. [link] It seems like a lot of small engines get preserved because they are relatively inexpensive to repair and maintain... though in this case the drive rod bearings seem to be an issue.
This one is at Fox River Trolley Museum in South Elgin treading the same rails it was built to serve in 1946.
The Vulcan Ironworks in Wilkes-Barre, PA built these under contract around WWII. Several of them were delivered to the US Naval base in San Diego. The last one of that order completed in 1945 was transported from the erecting shop floor to the central railyard in Wilkes-Barre, a journey of less than 1 mile, where it remained until the late 90's early 2000's. It seems that due to the end of WWII the US Government canceled the remainder of their order. It has since been removed and was sent for a full frame-up restoration to operational status. It is intended to pull a dinner train when completed.
These are neat little engines. My local museum has one of USAF heritage, although it is listed as a GE unit. It looks identical, siderods and everything.
I found that on someones flikr, it was about the best photo of the unit I could find since the museum doesn't have a photo of the unit online. If you look closely, you can see the siderods.
I actually crawled under this thing to look. There is a "motor" on only one axle. The second axle is thus powered from the first by the connecting rods.
They do look similar but no siderods. And when you start looking at the details you see how differnt they really are.
I found that on someones flikr, it was about the best photo of the unit I could find since the museum doesn't have a photo of the unit online. If you look closely, you can see the siderods.