In the late 1930s, Northern Pacific issued a series of brochures that folded up to be 8-1/2″x11″ or a bit smaller. The brochures featured many black-and-white photos with the NP logo and a few headlines highlighted in red. This is a “pictorial” because 7 of the 8 pages are photos, with only one page of text.
The brochure is undated but mentions both the North Coast Limited and Yellowstone Comet without mentioning air conditioning. Both trains were at least partly air conditioned by 1935, so my guess is this is from 1934.