Here's another of my favorite Montana railroad posters. This one was painted about 1930 or so by a man named Gustav Krollman, who worked as an artist for the Northern Pacific for several years. Krollman did a whole series of posters for the NP in a similar style, depicting attractions along the NP line. (And a few that weren't -- his subject matter extended all the way to Alaska.)
It's a gorgeous and evocative image, without a doubt. (Those are the Absarokas in the background.) I have to say, though ... the train looks more like one that should be headed to Hogwarts, rather than Livingston.