Jim,
I have a an issue on loan to me for research purposes. It's called the New Mexico Railroader.
As to where to find more issues, I don't know. This one doesn't contain any narrow gauge. I've been interested in trying to contact the author of this article, Kent Stephens, but haven't had any luck.
I don't know if anybody can use it to track them down, but the info on the back of the issue reads:
The New Mexico Railroader is published at 844 A 43rd St., Los Alamos, N. Mex., 87544, by the Railroad Club of New Mexico, Inc., G.R. Swain, editor.
This issue was published in January 1966.
J.B. Bowers
Pueblo, Colorado