On the Imprint design blog, J.J. Sedelmaier has an exhaustive take on the gorgeous posters that were used to advertise Chicago rail service in the 1920s. The South Shore line stretched as far as my hometown of South Bend, Indiana, meaning replicas of these prints could be seen in some of the fancier shops around town growing up. I still love looking at them, and all of them are shared in the post.