I’ve seen this cover on booklets published by a variety of railroads, including the New York Central and Pennsylvania. This means the booklet was originally designed by the Expo, which left space for railroad logos the cover (which is actually the back cover) as well as two pages in the back for individual railroads to fill in.
Click image to download a 11.8-MB PDF of this 20-page booklet.
In this case, the railroad is obviously the Burlington, which uses its two pages to brag about the then-relatively new (having opened in 1925) Union Station, Burlington exhibits at the fair, and “the West’s Great Trains”: the Aristocrat, the Overland Express, Ak-Sar-Ben, American Royal, Black Hawk, and Mississippi Riverview, among others. This booklet is for the fair in 1933, and the Burlington had a very different train on exhibit when the fair was extended into 1934.