EMD "E9" Diesel Locomotives

Last revised: October 28, 2022

By: Adam Burns

The E9 was the builder's final in the series built during a ten year production run beginning in the 1950s. The locomotive varied little from the earlier E7 and E8, save for some minor external changes and upgraded prime mover, which offered the most horsepower of any passenger model the builder ever produced.

With passenger rail travel in perpetual decline by the time it was manufactured far fewer E9s sold in comparison to its counterparts. 

Interestingly, while less than 150 A and B units were ultimately built nearly 50 remain preserved or in use today, thanks largely to the model being the last in its class. The most notable of these are in service on Union Pacific, originally purchased by the railroad.  

Today, the Class I maintains a small fleet as power for its business train and other special runs.  You can also catch an original Southern Pacific unit in its Daylight livery at the California State Railroad Museum.


An Electro-Motive photo featuring recently completed Southern Pacific E9A #6051 in December, 1954. Today, this unit is preserved and operational in her "Daylight" livery at the California State Railroad Museum.


The E9 began production in the spring of 1954 as the builder's final entry in a series that spanned ten different models, dating back to the Electro-Motive Corporation's EA of 1937, built for the Baltimore & Ohio and Santa Fe (E1).

The E9 was quite similar to the E8 externally and internally carried similar to components to models dating back to the E6. Outwardly, it was 70-feet long with a grill parallel to the cab windows running along the entire flank of the carbody with four centered port holes.

It continued to feature an A1A-A1A truck setup (whereby the center axle was unpowered) and used GM's model D37 traction motors enabling the E9 to produce 31,000 pounds of continuous tractive effort and 56,500 pounds continuous (the same as nearly all of the E models).

Union Pacific E9's in freight service during the late 1960s. Location not listed. American-Rails.com collection.

Internally, the E9 was the only unit in the series to feature GM's model 567C prime mover, which could produce 1,200 horsepower.

Featuring two 12-cylinder 567Cs the E9 offering 2,400 horsepower, easily making it the most powerful in the series. The locomotive's overall weight (for A units) remained in the same as other Es, 157.5 tons.

With passenger rail travel on the decline by the 1950s and railroads beginning to use other models in passenger service (such as FP7s), sales for Es slowed considerably.

When production of the E9 had ended in early 1964 just 100 E9As and 44 E9Bs had been built for ten Class I railroads (the Union Pacific picked up the most, 35 A units and 34 B units).

Illinois Central's pair of "Executive" E9A's, #101 and #100, layover at the Woodcrest Shops in Homewood, Illinois on August 31, 1996. These units were built as Chicago, Burlington & Quincy E8A's #9977 and #9938A. Author's collection.

Other systems to purchase the E9 included the Baltimore & Ohio (4 A units), Burlington (16 A units), Chicago & Eastern Illinois (1 A unit), Milwaukee Road (18 A units, 6 B units), Florida East Coast (5 A units), Illinois Central (10 A units, 4 B units), Kansas City Southern (1 A unit), Seaboard Air Line (1 A unit), and Southern Pacific (9 A units).

It is rather interesting that the UP saw the need to purchase such a large fleet of new passenger locomotives considering the environment of rail travel during the 1950s and 1960s. The railroad actually purchased more E9s than it did either E7s or E8s.

67293857235627527683970989.jpgMilwaukee Road E9A #35-C awaits departure from St. Paul Union Depot with an eastbound "Hiawatha" in May, 1968. Fred Byerly photo. American-Rails.com collection.

Data Sheet

Entered Production4/1954 (Illinois Central #4034)
Years Produced4/1954 - 1/1964
Engine567C (2)
Engine BuilderGM
Length70' 3"
Height (Top Of Rail To Top Of Cab)14' 7"
Width10' 7 ½"
Weight315,000 Lbs (A Units): 290,000 Lbs (B Units)
Fuel Capacity1,200 Gallons
Air CompressorGardner-Denver
Air Compressor ModelWXO
Air Brake ManufacturerWestinghouse
Air Brake Schedule24RL
Truck TypeBlomberg
Truck Wheelbase14' 1"
Wheel Size36"
Steam Generator ManufacturerVapor-Clarkson
Steam Generator Capacity1200 Lbs/Hr
Traction MotorsD37 (4), GM
Primary GeneratorD27 (2), GM
Auxiliary GeneratorDelco
MU (Multiple-Unit)Yes
Dynamic BrakesYes (A Units)
Gear Ratio57:20
Tractive Effort (Starting)56,500 Lbs at 25%
Tractive Effort (Continuous)31,000 Lbs at 11 mph
Top Speed85 mph

Production Rosters


Owner Road Number(s) Quantity Date Built
Baltimore & Ohio34-40 (Evens)41955
Burlington9985A-9989A, 9985B-9989B, 9990-9995161954-1956
Chicago & Eastern Illinois110211958
Florida East Coast1031-103551955
Illinois Central4034-4043101961
Kansas City Southern2511959
Milwaukee Road36A-38A, 36C-38C, 200A-205A, 200C-205C181956-1961
Seaboard Air Line306011963
Southern Pacific6046-605491954
Union Pacific900-914, 943-962351954-1964


Owner Road Number(s) Quantity Date Built
Illinois Central4106-410941956-1957
Milwaukee Road200B-205B61956
Union Pacific900B-904B, 910B-913B, 950B-974B341954-1963

Illinois Central E9A #4040 is tied down at South Yard in Memphis, Tennessee on November 13, 1966. American-Rails.com collection.

In any event, the E9s that are still owned by Union Pacific as part of its heritage program include E9Am #949 and #951 along with E9B #966-B and E9Bm #970-B (the 'm' designation refers to units repowered with just one prime mover).

Interestingly, despite their slow sales numbers, several railroads saved their E9s for use on business trains or for other specialized services.

As such, 42 are preserved today. Some of these include Baltimore & Ohio #36; Burlington numbers #9989-9989A and #9990; Union Pacific E9B #967B; Milwaukee Road #33C, #37A, and #38A; Union Pacific #912A; and Southern Pacific #6051. 


  • 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.
  • 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.
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