The Pennsylvania Railroad's mighty T1 was in a class of its own.
Classic Streamliners - TRAINCYCLOPEDIA
PRR Locomotive Classification
Locomotive classification on the Pennsylvania Railroad took several forms. Early on, steam locomotives were given single-letter classes. As the 26 letters were quickly assigned, that scheme was abandoned for a more complex system. This was used for all of the PRR's steam locomotives, and — with the exception of the final type bought (the E44) — all electric locomotives also used this scheme.
PRR 5711 at Chicago Union Station for National Train Day, 2011.
By vxla from Chicago, US [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
The Pennsylvania Railroad was slow to dieselize. By the end of WW2 they only had 18 units. However over the next 22 years they had acquired a total of 3,005 units. They bought from all the manufacturers: Alco 516 units, Baldwin 643 units, EMD 1,479 units, Fairbanks-Morse 200 units, General Electric 145 units, and Lima 22 units. This diversity was a nightmare for the maintenance department as there was very little compatibility among the different builders.
PRR E44 Electric Locomotive No. 4432.
Pennsylvania Railroad No. 7002 at the Railroad Museum of Pennsylvania.
By Photo by and (c)2016 Derek Ramsey (Ram-Man) - Self-photographed, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47591930
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Text: wikipedia.org. Images: Public Domain; http://www.commons.wikimedia.org (unless otherwise specified) and 17 U.S. Code § 107 fair use. References: Lewis, Robert G. The Handbook of American Railroads. New York: Simmons-Boardman Publishing Corporation, 1951, 2nd Edition 1956. Site Map Contact webmaster HERE.