You didn't give a link but I expect I can "google" one up.
I model Santa Fe in Texas, and keep information filed on freight cars of southwestern railroads that might have appeared on Santa Fe here. For that purpose, I consider PRR as an "honorary southwestern railroad".
here you are! http://www.prrths.com/Keystone%20Modeler/Keystone_Modeler.htm
The fact that the Pennsy owned ten percent of the cars means everyone does model the PRR prior to Penn Central and one in ten cars or more should be PRR depending on traffic.
Thanks for the link ndbprr,
I model mainly the New Haven, but I've always had great admiration for the mighty Pennsy. Whenever time, money will let me, two of my favorite haunts are Cresson and the Enola yards (the Iron Bridge) . This publication is quite professional, and quite an asset to any RR modeler, Pennsy or not, thanks again, it's on my favorites.
Brad.