An original color advertising poster for Chicago, Milwaukee, St. Paul & Pacific Railroad that has been dry mounted to foam core backing and measures 19 5/8 x 25 5/8". The poster features a western graphic with Gallatin Gateway to Yellowstone National Park sign, information about The Milwaukee Road's Gallatin Gateway Inn and Yellowstone circa late 1920s or early 1930s. The bottom features a system map Electrified between the Rockies and the Sea. The poster shows general discoloration from age, stain spots at the bottom right, and some wear along the top edge and bottom left edge. Poster shows tape along the bottom right edge. See photos for best description.