This brochure was apparently aimed at Minnesotans and Wisconsinites, as it included schedules and fares for taking one of the Twin Cities Zephyrs from the Twin Cities to Chicago, and then the Denver Zephyr to Colorado or California Zephyr to San Francisco and Los Angeles. Since the Morning Zephyr from the Twin Cities arrived in Chicago at 2:50 pm and the California Zephyr left at 3:10 pm, the brochure subtly encourages people to change trains at Aurora, Illinois, instead, allowing an hour and 40 minutes to transfer people and luggage rather than just 20 minutes.
There’s no date on this brochure, but it is presumably from around 1966, as when folded it has the same dimensions as yesterday’s Colorado brochure. If so, then the quoted fare from the Twin Cities to Denver of $61.30 translates to about $340 today. Fares to San Francisco were about double that.
Those familiar with Colorado (or with Colorado travel brochures) will recognize the right side cover photo as Hallett Peak and Bear Lake, in Rocky Mountain National Park. The same lake from a different angle that doesn’t show the peak is pictured in the above 1965 ad, which encourages people to take Burlington to Colorado, California, or the Pacific Northwest. It seems likely that National Geographic readers from Minnesota or Wisconsin who used the coupon would receive the above brochure in response.