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EMD "E7" Locomotives: Specs, Roster, History

Last revised: February 20, 2025

By: Adam Burns

Electro-Motive's E7 series passenger diesel is generally considered the builder's first in the post-World War II era even though it was introduced in February, 1945, seven months before the conflict officially ended.

It established many of EMD's standardized practices in both the freight and passenger models, including the first passenger diesel to feature the builder's "bulldog" nose look first introduced on the FT in 1939.

The E7 continued Electro-Motive's passenger line that had been formally launched with the EA of 1937, and continued through the E6 of 1940-1942.  As EMD's reputation grew it sold increasingly more E units that reached a crescendo with the E7. Internally, the E7 varied little from the E3 through E6.

Ironically, despite 510 "A" and "B" units constructed be Electro-Motive just one is preserved today; Pennsylvania #5901-A (out-shopped by the builder in September, 1952). 

While she is no longer operable you can see this locomotive adorned in its handsome Tuscan Red livery with cat whiskers, housed indoors at the Railroad Museum of Pennsylvania in Ronks, Pennsylvania.  Perhaps most amazing is that more Alco PA's survive than this popular EMD model!

Photos

This Electro-Motive photo, taken in the spring of 1945, features Great Northern E7A set #504A/B wearing a rare livery ordered for the postwar "Empire Builder." As Bob Le Massena notes: "As was common at the time the motive power arrived long before the cars were delivered. In this instance, the delay was a year-and-a-half. By that time [the] locomotives had been altered somewhat. The simplified mountain goat emblem was removed from each side, replaced by the traditional herald (with its 'Great Northern Railway' name ring around the outside) mounted on a plaque low on the nose door. A second headlight was mounted in the upper half of the door, and the illuminated number-plate was moved upward to a position just below the original headlight. "The Great Northern" in gilt script around the nose was removed to make room for the herald plaque, and the dark green bands which had ended at the new herald were extended on around the nose and curved down to a point on each side of the nose door."

Overview

The E7 was Electro-Motive's first in the series featuring the now-classic "bulldog" nose.  As Brian Solomon notes in his book, "Electro-Motive: E Units And F Units," the ease of War Production Board restrictions on domestic diesel locomotive production enabled EMD to unveil a redesigned passenger model.

In doing so, and after listening to customer feedback, EMD offered many new features on the E7, including standardization of components that were interchangeable among multiple locomotive models.

The E7's internal components were more or less similar, or the same, to earlier models.  While the locomotive did feature a slightly upgraded 12-cylinder, model 567A prime mover (in place of the earlier, original 567 model)  it still carried a 2,000 horsepower rating.

The truck setup remained the same as an A1A-A1A (meaning the center axle was unpowered) and model D7 traction motors.   As a passenger model, the E7 was offered with steam generators; used not only for heating purposes but in some cases with early air-conditioning systems as well.

Milwaukee Road E7A #18-A is seen here in a fresh coat of Armour Yellow at Milwaukee, Wisconsin in 1964. Russ Porter photo. American-Rails.com collection.

By 1945 EMD's products were well known for their reliability, efficiency, and ruggedness.  The builder paved the way for the fall of steam thanks to its FT, and then went on to silence the motive power forever with future models like the F3, F7, GP7, GP9, and others. 

Kansas City Southern (Louisiana & Arkansas) E7A #12, at the road's engine terminal in Pittsburg, Kansas, circa 1968. This unit was acquired from the Maine Central in 1962. Mac Owen photo. American-Rails.com collection.

The E7 was available with four different gearing ratios including:

• 52:25 (Maximum Speed = 117 mph)

• 55:22 (Maximum Speed = 100 mph)

• 56:21 (Maximum Speed = 92 mph)

• 57:20 (Maximum Speed = 85 mph)

Numerous railroads would go on purchase the E7, from the Baltimore & Ohio and Atlantic Coast Line to the Milwaukee Road and Southern Pacific, as the industry geared up for the postwar streamliner boom.

Interestingly, not every railroad was satisfied with the E series; Southern Pacific stated they only performed well on relatively flat grades found east of the Mississippi River and were not rugged enough to handle the harsh operating conditions and stiff grades of the West.

Missouri Pacific E7A #4 is showing her age at Poplar Bluff, Missouri, circa 1968. This unit was built for MP subsidiary Texas & Pacific as #2003 in 1947. American-Rails.com collection.

The railroad went on to purchase just one E8 and a handful of E9s.  Interestingly, it found Alco's PA much more to its liking in passenger assignments.  The Santa Fe carried a similar sentiment.  In fact, it purchased no E7s, E8s, or E9s, instead preferring EMD's sure-footed F3 and F7 models to lead its top trains.  

While EMD's entire passenger line was never as successful as its freight models, the E7 proved its most popular as the builder sold some 428 "A" units and 82 "B" units by the time production had ended in the spring of 1949.  It was replaced with the E8, which debuted later that year, a slightly more powerful variant that also incorporated a number of design improvements.

Rock Island E7A #633 is stopped at the Morton Street Depot in Peoria, Illinois with train #11 from Chicago in July, 1968. American-Rails.com collection.

The reliability of Electro-Motive's E7 and later E models could been seen in their longevity.  Many of those not traded in and replaced by the later E8 saw service up until Amtrak, although by that time with service in severe decline many units had been extremely abused and were simply worn out. 

While no E7s actually made it into service on Amtrak, the carrier did utilize a number of aging E8s, E9s, FL9s, and FP7s.  Sadly, the Rock Island, which could not afford to join the new carrier (railroads had to pay a fee to the carrier to hand over their remaining passenger trains), continued to use some of its worn out E7s in passenger assignment through the latter 1970s.

Data Sheet and Specifications

Production Rosters

E7A

Total Built = 428

E7B

Total Built = 82

An aging Pennsylvania E7A, #5872, lays over in Bay Head, New Jersey along the New York & Long Branch on April 3, 1966. Author's collection.

Pennsylvania #5901-A

As a comparison, the only other locomotive builder to truly compete in the passenger model market with EMD was Alco and its PA series. 

While often considered the most beautiful diesel locomotive ever built, unfortunately its early 244 prime mover, a troublesome engine in main line service, caused many railroads to shy away from Alco.

Today, Pennsylvania #5901-A has been beautifully restored (cosmetically) at the Railroad Museum of Pennsylvania and is housed indoors and out of the elements, where it can be regularly visited by the general public.

Louisville & Nashville E7A #798 has the "Danville Flyer" in Chicago on May 30, 1970. American-Rails.com collection.

Sources

• Foster, Gerald. A Field Guide To Trains. New York: Houghton Mifflin, 1996.

• Hayden, Bob. Diesel Locomotives: Cyclopedia, Volume 2 (Model Railroader). Milwaukee: Kalmbach Publishing Company, 1980.

• Marre, Louis A. Diesel Locomotives: The First 50 Years, A Guide To Diesels Built Before 1972.  Milwaukee: Kalmbach Publishing Company, 1995.

• Pinkepank, Jerry A. Diesel Spotter's Guide.  Milwaukee: Kalmbach Publishing Company, 1967.

• Rail Heritage Publications. Early Diesel-Electric and Electric Locomotives. Simmons-Boardman Publishing Corporation, 1983.

• Solomon, Brian.  EMD Locomotives.  Minneapolis: MBI Publishing Company, 2006.

• Solomon, Brian.  Electro-Motive E-Units and F-Units: The Illustrated History of North America's Favorite Locomotives.  Minneapolis:  Voyageur Press, 2011.