John,
Not sure if this is what you are looking for, but the "pennsyrr" site has several "assignment of lightweight sleeping cars" lists for various years.
http://pennsyrr.com/index.php/passengerScroll about halfway down the page. I used the 1954 list to help determine which cars were interchanged with L&N and ran on their trains to New Orleans.
The Pennsy historians and modelers have been very generous about sharing info.