Old ads refer to "tourist sleeping cars" available at a lower price
than regular Pullman cars.

The following 1947 ad from the Milwaukee Road has them (lower
right corner), and they appear to be as nice or even nicer than
regular Pullman cars.

https://books.google.com/books?id=llEEAAAAMBAJ&lpg=PA109&dq=life
20milwaukee%20road&pg=PA109#v=onepage&q=life%20milwaukee%20road&f=false

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