CNW took delivery in 1958 of 13 Pullman Standard bi-levels configured for long distance service.
These were used on the Flambeau 400 (Chicago-Green Bay-Ashland) and Peninsula 400 (Chicago-Green Bay-Ishpeming), and were an upgrade promised to the State of Wisconsin in exchange for receiving approval to discontinue other non-400 passenger trains. The long distance bi-levels were cosmetically and mechanically identical to the 4x4 windowed PS commuter coaches. One car (903) had a slightly different window configuration and servicing door at forward end of the car where the bar/galley were located.
Two photos of car 903 are below:
(source: Chuck Zeiler @ http://www. rrpicturearchives.net/ showPicture.aspx?id=4103488)