The EMD F7 is a model of 1,500-horsepower (1,100 kW) diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD).

The F7 was the fourth model in GM-EMD's successful line of F unit locomotives, and by far the best-selling cab unit of all time. In fact, more F7s were built than all other F units combined. It succeeded the F3 model in GM-EMD's F unit sequence, and was replaced in turn by the F9.

F7 Phase IIb/IIc: EMD offered a larger dynamic brake package (with 48" fans) but the PRR didn't purchase it. 6. The InterMountain F7 in Pennsy livery features a square window on the rear end door, so it should be a Phase Ib.

The term F-unit refers to the model numbers given to each successive type (i.e. F3, F7, etc.), all of which began with the letter F. The F originally meant "fourteen", as in 1,400 horsepower (1,000 kW), not "freight".

The enhancements provided EMD’s F7 with increased tractive effort and improved longevity in continuously operating the unit’s new D27 traction motors. Some railfans separate these F3s into the unofficial “F5” grouping. PRR’s roster included approximately 80 F3As and 55 F3Bs with 25 examples falling into the F5 grouping.

Industry-leading Model Features: Paragon4 Sound & Control System featuring ROLLING THUNDER. Integral Dual-Mode Decoder with Back EMF for Superb Slow Speed Operation in DC and DCC. Precision Drive Mechanism Engineered for Heavy Towing and Smooth Slow Speed Operation. All Wheel Electrical Pick-up.

The EMD F7 is a 1,500 horsepower diesel locomotive built by General Motors' Electro-Motive Division between 1949 and 1953. The F7 was EMD's fourth model in the line of F-unit locomotives, and was by far the best-selling cab unit of all time.

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Mar 24, 2025 · The F7 was EMD's fourth model in the line of F-unit locomotives, and was by far the best-selling cab unit of all time. The F7 primarily differed from the F3 in internal equipment, but there were some noticeable external changes such as the grills and the dynamic brake hatches.

A-unit: PRR version with antenna, numbered #9674. MV headlight lenses. The model is equipped with a closed-door pilot as a lead unit. Manufactured in Korea by Samhongsa. Bag of extra detail parts and screws included with both locos.