I thought it was something standard gauge as well, due to the size. But I didn't know so that's why I asked. I could not read the number on the tender. The whole thing, timbers and all, has a thick coat of barn red paint on it. I could barely read "Rio Gran" on the side. The gons are in sorry shape. They are worse than some of the ones in Durango.
Thanks for the info everybody.
Rob