- E-bookBessemer and Lake Erie RailroadKenneth C. Springirth
- E-bookNorthwestern Pennsylvania RailroadsKenneth C. Springirth
- E-bookPittsburgh Streamlined TrolleysKenneth C. Springirth
- E-bookSuburban Philadelphia TrolleysKenneth C. Springirth
- E-bookEast Broad Top RailroadKenneth C. Springirth
- E-bookJohnstown Trolleys and InclineKenneth C. Springirth
- E-bookArcade and Attica RailroadKenneth C. Springirth
- E-bookSoutheastern Pennsylvania TrolleysKenneth C. Springirth
- E-bookGreater Erie TrolleysKenneth C. Springirth