This postcard folder must have been issued shortly after 1934, when the Dotsero Cutoff allowed trains through the Moffat Tunnel to connect to Rio Grande tracks to Grand Junction and Salt Lake City. Soon after that year, the Rio Grande advertised that it had two routes across the Rockies, the Moffat Tunnel and the Royal Gorge routes. But this folder refers to the former as the James Peak route, after the mountain through which the Moffat Tunnel was bored.
The folder contains 20 color lithographs. Like other postcard folders, I present this in three pages so as to show all of the cover as well as the pictures.