The Oregon-Washington Limited was an early Northwestern-Union Pacific train from Chicago to Portland. I can’t find much information about it–it isn’t even listed in Wikipedia’s list of named passenger trains–but it began operating before 1910 and continued at least into the 1930s.
Click image to download a PDF of this letterhead. Click here to download a PDF of the matching envelope.
For many years, this was the premiere train on this route, roughly equivalent to the Overland Limited or Los Angeles Limited except that the Portland train had coaches as well as Pullmans. The ad below is from the April, 1910 issue of Scribners magazine, and similar ads were placed in Century and other magazines.