The cover of the 1928 booklet has the same image and typography as the 1927 edition, but the addition of two colors, orange and blue, make for a more attractive cover as well as testify to the success of the program.
Click image to download a 7.5-MB PDF of this 20-page booklet; click here for a non-OCR version.
The railroads added several new tours in 1928, including Black Hills-Yellowstone and Black Hills-Yellowstone-Rocky Mountain and some minor variations of the 1927 tours. Most important is a 20-day tour to California via the Royal Gorge (with a stop at Colorado Springs and the Garden of the Gods), including visits to Yosemite, San Francisco, Los Angeles, and San Diego and return via the Grand Canyon. The only part of this tour going over the Burlington partner rail lines is the first day or so to Denver; after that, the trip is over the Rio Grande, Western Pacific, and Santa Fe railroads. While this could not have been very profitable for the partner railroads, they must have felt compelled to add it to compete with the Union Pacific tours.
Page 2 of this booklet notes that 1928 is the fourth year of Burlington Escorted Tours. That’s how we know that NP’s early Yellowstone guide, which introduces Burlington Tours, is from 1925.