I like me some GN!!!
My 1st train HO) was a Bachmann GN 2-8-0 in Glacier scheme. Probably not prototypical but at the time it was beautiful.
I may be wrong, I really haven't studied GN all that much, but it seems like they had a lot of similar equipment to my Seaboard Air Line, at least their steamers with the front-mounted air pumps seem similar to the SAL Q3 Mikes.
If I was into SAL, GN would be my next choice.
(I need to get a couple of O scale boxcars with Rocky on them)