To further nydepot's posting:
Tom Madden's Pullman database is a wonderful compilation of all sorts of Pullman car information - really worth taking a look at:
The Database has this information on Glen Saddell, a 6 Compartment, 3 Drawing Room sleeper:
Lot 4974, Plan 3523a, in-service date 8/23/26, air conditioned in 1939, sold to Darby Wood in 1967. (Whole bunch of cars that still exist were in that sale, by the way).
Underbody equipment layout:
Coloring descriptions are interesting:
Pull. Std.; D5497 Maroon & gray (10/31/51); D6435B (1/27/55)
Color code description: http://home.att.net/~pullmanproject/Paint_Text.htm
Of course, much, much more construction information can be found in Illinois Railway Museum's Pullman Archive -- stuff that will be incredibly helpful for anyone looking to work on the car. (Lot and Plan numbers help greatly in pulling up information).