References

Career of a Champion: The Story of 'Old Rivets' 4800
Frederic Abendschein and Dan Cupper ©1984
Lancaster Chapter of the NRHS
342 W. Fritz Avenue
Quarryville, PA 17566
Notes: 3 Color and 75 Black/ White Pictures; 56 Pages; Paperback

Electric Traction of the Pennsylvania Railroad 1895 – 1968
Michael Bezilla
(The Pennsylvania State University)

Pennsy Electric Years
William D. Volkmer
(Morning Sun Books)

Pennsy Power
Alvin F. Staufer
The Standard Printing & Publishing Co.; Carrollton, OH; ©1962

Pennsy Power II.
Alvin F. Staufer and Bert Pennypacker Stauffer
Litho Plate Co.; 218 E. Washington St.; Medina, OH; ©1968

Pennsy Power, Steam and Electric Locomotives of the Pennsylvania Railroad 1900-1957
Alvin F. Staufer
(The Standard Printing & Publishing Co.)

The Great Book of Trains
Hollingsworth, Brian and Arthur F. Cook
Portland House, New York, NY. (1987)

The Pennsylvania Railroad Under Wire
Middleton, William D.
Kalmbach Publishing, Waukesha WI. (2002)

The Remarkable GG1
Karl R. Zimmermann
(Quadrant Press Review)

Under Pennsy Wires
Paul Carleton
(D. Carleton Railbooks)

Vintage Rails
Pentrex, Inc.
Fall 1995

When the Steam Railroads Electrified
William D. Middleton
(IKalmback Books)

Sources:

http://www.spikesys.com/GG1/

http://www.steamlocomotive.com/