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.
Read more about PRR Locomotive Classification: Non-standard Electric Classification, Diesel Classification
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—Mary Wollstonecraft (1759–1797)