Mystery 3ft narrow gauge steel caboose *LINK* *PIC*

I’m working on my brass model of a narrow gauge On3 caboose. Please see the attached image. Now I’m looking for more information and pictures of the caboose. I do have the original drawing but as always, drawings and original is not always the same match. So if you have some measuring and drawings, please get in contact with me. And if you don’t know the caboose or the railroad. It’s not a mystery. The railroad is narrow gauge 3 feet. It’s not the White Pass, but they are running some White Pass engines on their track. Yes, it’s in the USA. …………….
Full brass caboose will be ready in July or August this year.
Now I’m looking forward to more images. THANKS,
Boerries