i have attached a photograph of some of my AMT cabooses in my collection. To my knowledge, the smoke jack on your caboose is not original to AMT. Also, as you can see by the examples in the photographs, your cab is missing the marker lamps. Both the smoke jack and the marker lenses are commonly missing, and creative substitute items are often found in their place.
All of the frames of the cabooses shown in the photos are marked such as yours with the C-101. It was the standard frame for AMT cabs, regardless of road name. They were great cabooses for their time.
Hope this helps,
C.J.
