Hi,
For you fans of the Turtle Creek, PA area and big train yards, I found this link to a history of the railroad town of Pitcairn (next to Trafford my modeling town). There are about three chapters specifically on the PRR, but informative bits and pieces can be gleaned on products, facility locations, and etc. from reading them all. It's short but informative:
Pitcairn Historical Society Stories of the RR Town
Enjoy!
Tomlinson Run Railroad