Just saw your note.
I am sure someone by now has directed you to the Pennsylvania Reading Seashore Lines Historical Society: http://www.prslhs.com/
It is a great resource, visited by many men who actually worked on the PRSl & the Conrail follow-up.
SJRail.com is also a good resource: http://www.sjrail.com/wiki/index.php?title=Main_Page
When possible, I also try to document what I uncover on my blog: http://rickb773-prsl.blogspot.com/