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Locomotive Phases - EMD GP30

The first prototype GP30 was built in 1961. It retained the turbocharged 16-cylinder 567-series engine of the GP20 (uprated from 2000 to 2250 horsepower) and was initially known as a "GP22", following EMD's short-lived tradition of linking the model name to horsepower. After a number of design changes from this initial demonstrator, including the addition of several features that would be carried through to subsequent models, the name was changed to "GP30" and it entered regular production in 1962. The name change was partly a marketing response to competition from the 2400-hp ALCO RS27 and 2500-hp GE U25B, both of which had a horsepower (and model name) advantage.

The GP30 marked the first significant departure from the utilitarian carbody design introduced by the GP7 and carried through to the GP20. The addition of an inertial air intake system behind the cab—along with an renewed emphasis on appearance—resulted in a restyled carbody with a raised fairing extending from the cab roof to the middle of the long hood. With the inertial air intake occupying the front of the hood, the radiators were combined into a single section at the rear of the hood, with two 48" fans flanking a single 36" fan. In combination with EMD's signature swing-hanger ("Blomberg") trucks, the carbody of the GP30 makes it unlikely to be confused with anything else.


These phases are based on those listed in the GP30 roster compiled by Robert Sarberenyi. Although a few GP30 orders appear to be of a slightly different phase than indicated by Sarberenyi, I've found only a few detail additions in terms of the phases themselves.

Phase 1a

Phase 1b1

Phase 1b2

Phase 1c1

Phase 1c2

Phase 1d

Phase 1e

Phase 2a

Phase 2b


Sarberenyi, R. EMD's GP30 - Original Owners. Retrieved October 2012 from

Unofficial EMD Homepage. (2001). GP30 Order Numbers. Retrieved January 2015 from