Non-standard Electric Classification
- E2b - experimental B-B General Electric-built AC electric locomotives (3 pairs built).
- E3b - experimental B-B-B Baldwin-Lima-Hamilton-Westinghouse AC/DC rectifier locomotives (1 pair built).
- E2c - experimental C-C Baldwin-Lima-Hamilton-Westinghouse AC/DC rectifier locomotives (1 pair built)
- E44 - 1960 C-C General Electric AC/DC rectifier freight locomotives.
The horsepower-based designation unique to the E44 would be retained and expanded by Penn Central to cover the former New Haven EF4s (E33) and EP5s (E40).
Read more about this topic: PRR Locomotive Classification
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