Einfach, aber großartig : die Dampfloks der Reihe K4s der Pennsylvania Railroad
The railroad that never was : Vanderbilt, Morgan, and the South Pennsylvania Railroad
Railroads of Pennsylvania : your guide to Pennsylvania's historic trains and railway sites
Failure rates and data driven policies for vehicle safety inspections in Pennsylvania
The Ma & Pa : a history of the Maryland & Pennsylvania Railroad
Grove City, Pennsylvania, ADAP Request No. 71-1-7-42-0035
Evaluation Report: Driver Experience with the Enhanced Object Detection System for Transit Buses
Conquering Gotham : a gilded age epic ; the construction of Penn Station and its tunnels