A little clarification...
In Joshua's post (
here), in really, *really* small print, is information about this car type/revenue capacity.
This car is known as a 10-6 sleeper, because it has 10 roomettes and 6 bedrooms.
The roomettes are what you are calling "seating compartments", and what you are calling "roomettes" are actually the bedrooms.
The roomettes have a fold-down bed, allowing for a private compartment to sit in during the day, and with the bed folded down, a place to sleep during the night.
More info (with link to downloadable copy of a Pullman brochure)
here.