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Alco "DL-109" Locomotives: Data Sheet, Photos, History

Last revised: December 21, 2024

By: Adam Burns

The American Locomotive Company's first true production diesel was the DL series (the "DL" stood for Diesel Locomotive), a streamlined cab design similar to then-Electro-Motive Corporation's EA model of 1937.

The series would come in four different "models" (more on that below) although as John Kirkland notes, there was never any such designations made by Alco, the builder simply listed the entire production run as the DL-109/DL-110.

Overview

The locomotive was equipped with Alco's model 538T, and later 539T prime mover, a reliable engine that was utilized in most of its production model switchers.  It appears the DL-109/DL-110 was more of a testbed series rather than a long-running cataloged model, perhaps partly due to the United States entering World War II, which disrupted diesel development.

When production had ended in 1945, to make way for the new FA/PA series, less than 100 DLs had been sold.  Unfortunately, today, there are no known original DL  units preserved as most were scrapped following their years of service.

Photos

8094871265j2j09071087.jpgNew Haven DL-109 #0700 has arrived at Springfield, Massachusetts during the 1950s. American-Rails.com collection.

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The DL series essentially kicked off the builder's entrance into the mainstream diesel locomotive market. The American Locomotive Company had been dabbling in this market dating back to 1918 when it teamed up with General Electric and Ingersoll-Rand to design a motor car. 

However, the company continued to remain focused on steam designs, believing this form of motive power would always remain the prevalent type even as Electro-Motive, later purchased by General Motors, began developing successful diesels as early as the 1920s.

At first EMC only constructed trainsets and small switchers but by the late 1930s it unveiled the passenger EA cab design, followed soon after by the freight FT model that revolutionized the industry.

This left Alco somewhat scrambling to unveil their own diesel locomotive. While the company proved it could manufacture a reliable, rugged, and efficient switcher their main line examples could simply never match what their competitor was producing.

The very first model was designated the DL-109 (it would later be sold  to the Chicago, Rock Island & Pacific and given #624, completed on January 3, 1940) and used a pair of the company's 538T prime mover, which was a four-stroke diesel that produced 2,000 horsepower combined.  The model's class listing was 606-DL345. 

9231274162456125658989826.jpgA handsome New Haven DL-109, #0735, departs Springfield Union Station (Massachusetts) with a passenger consist, perhaps the "Nathan Hale" or "Bankers," in 1952. Photographer unknown.

Its breakdown was as follow: "606" (6-wheel leading truck, no main drivers, 6-wheel trailing truck; no doubt this was a nod to the steam era classification), "DL" (Diesel Locomotive), and "345" (estimated weight, in thousands).

This engine was a product of Alco subsidiary McIntosh & Seymour of Auburn, New York.  While Alco's diesels performed well in early switchers, they struggled in main line applications.

Eventually Alco would produce "four" models, which varied slightly. Aside from the DL-103b they included the DL-105, DL-107, and DL-109. Alco also produced two models of cabless "B" units the DL-108 and DL-110.

For purposes of clarity, these "four" models will discussed in detail here.  However, they were not officially designated variants by Alco. 

According to Brian Solomon's book Alco Locomotives, Schenectady simply described all variants of this model as the DL-109/DL-110. He goes on to state the different specification numbers given to the locomotives were coined after the fact. 

This is further explained in John Kirkland's book, "The Diesel Builder's: Volume Two,"  detailing how railfans came up with the DL-103b, DL-105, and DL-107 designations on their own after studying various customer order files and noticing minute differences in various units.

As Kirkland explains, these changes only occurred months after the units had been in service when they were sent back to Schenectady for minor upgrades.  Ultimately, Alco listed all of its first-generation passenger locomotives as DL-109 (A units) and DL-110 (B units).

The styling of the DL was thanks to noted industrial designer Otto Kuhler.  Solomon states that Alco's cab model was essentially a mirror of Electro-Motive's save for the unique features Kuhler applied that sat it apart from its competitor.

Due to World War II restrictions Alco had difficulty in further developing not only the DL series but also diesel locomotive designs in general.

New Haven Railroad DL-109's, including #0744, #0743, and #0724, at the Dover Street Yard in South Boston during the 1950s. American-Rails.com collection.

This was the case across the industry as the U.S. government, through the War Production Board (WPB), limited domestic production (especially in regards to passenger locomotives) in general and asked all manufacturers to focus efforts on producing goods strictly for the war effort. 

It is somewhat interesting to wonder, had Alco been able to further refine its DL design could it have better competed with EMC/EMD?  Despite the restrictions the builder was able to convince the board in allowing it to produce some 60 DL-109s for New Haven between December, 1941 and April, 1945: #0700–#0759. 

This was only allowed as the locomotives were intended for dual passenger/freight assignments and given a 19:64 gear ratio according to Solomon while sporting General Electric's model GE-726 traction motors enabling 80 mph running. 

crip-dl109-chicago.jpgChicago, Rock Island & Pacific DL-109 #622 and an E7A are seen here in Chicago on October 5, 1958. Photographer unknown.

Data Sheet and Specifications

Rock Island #624

Alco Class606-DL-345
Date Completed12/13/1939 (Began testing.)
Model SpecificationDL-109
Engine538T, 6-Cylinder In-Line (2), Turbocharged
Horsepower1,000
RPM740
Carbody StylingAlco
Length (Between Coupler Pulling Faces)78' 11"
Weight339,000 Lbs.
Dynamic BrakesNo
TrucksA1A-A1A
Truck TypeTrimount
Truck Wheelbase15' 4"
Wheel Size40"
Traction MotorsGE 730
Traction GeneratorGT542
Gear Ratio25:58
Top Speed120 MPH

"A" Units

Alco Class606-DL-345
Entered Production9/20/1940
Model SpecificationDL-109
Engine539T, 6-Cylinder In-Line (2), Turbocharged
Horsepower1,000
RPM740
Carbody StylingAlco
Length (Between Coupler Pulling Faces)74' 6.5"
Weight331,700 - 357,500 Lbs. (Depending on options.)
Dynamic BrakesNo
TrucksA1A-A1A
Truck TypeTrimount
Truck Wheelbase15' 4"
Wheel Size40"
Traction MotorsGE 726 (Freight), GE 730 (Passenger)
Traction GeneratorGT557
Gear Ratios25:58 (120 MPH), 22:61 (100 MPH), 21:71 (80 MPH), 19:64 (80 MPH)
Top Speed120 MPH

"B" Units

Alco Class606-DL-345
Entered Production5/1/1941 (Santa Fe #50-A)
Model SpecificationDL-110
Engine539T, 6-Cylinder In-Line (2), Turbocharged
Horsepower1,000
RPM740
Carbody StylingAlco
Length (Between Coupler Pulling Faces)72' 4"
Weight331,700 - 357,500 Lbs. (Depending on options.)
Dynamic BrakesNo
TrucksA1A-A1A
Truck TypeTrimount
Truck Wheelbase15' 4"
Wheel Size40"
Traction MotorsGE 726 (Freight), GE 730 (Passenger)
Traction GeneratorGT557
Gear Ratios25:58 (120 MPH), 22:61 (100 MPH), 21:71 (80 MPH), 19:64 (80 MPH)
Top Speed120 MPH

The breakdown in sales for the DL-109/DL-110 series is as follows, based on before World War II and during the conflict.

  • Prior to the war, nine initial examples were completed for the Rock Island, GM&O, Rock Island, Santa Fe, and Southern.  It is these units that were broken down by railfans as the "DL-103b," "DL-105," and "DL-107."

  • In additional, 22 "A" units and 4 "B" units (the only ever built) were completed for the Milwaukee Road, Chicago & North Western, New Haven, and Gulf, Mobile & Ohio.
  •  
  • Finally, the War Production Board permitted construction of 52 "A" units during the war; most went to the New Haven along with one each to the Southern and GM&O.
36260997_1922260694732525_1554162937151619072_n.jpgRock Island #621, an early Alco DL-109 model rebuilt with an EMD prime mover by this date and nicknamed "Christine," is seen here in freight service Morris, Illinois in March, 1967. Rick Burn photo.

Overall, there were only minor differences among all of the DL locomotives produced.  According to Solomon the DL-109 carbody was 74 feet, 6.5 inches long while the cabless DL-110 measured 72 feet, 4 inches long.

They were 9 feet, 10.5 inches wide and 13 feet, 6 inches tall.  Additionally, the locomotives included turbo-charging and featured an A1A-A1A truck setup (meaning the two outside axles were powered with an unpowered center axle). 

The New Haven, which always liked Alco products, also enjoyed their DL-109s, which were adorned in a gorgeous deep green with gold trim. 

According to Solomon since the locomotives were geared for duel service the New Haven assigned them to the 157-mile New Haven to Boston route running two daily passenger assignments and then had them handle freights overnight.    

Production Rosters

DL-109

Railroad Road Number Construction Number Completion Date
Rock Island624691861/3/1940
Gulf, Mobile & Ohio270693349/20/1940
Gulf, Mobile & Ohio271693359/27/1940
Rock Island6226933611/29/1940
Rock Island6236939812/17/1940
Santa Fe50693995/1/1941
Southern (Cincinnati, New Orleans & Texas Pacific)6400694002/5/1941
Southern (Cincinnati, New Orleans & Texas Pacific)6401694012/6/1941
Chicago & North Western5007A694368/1941
Milwaukee Road14A6943710/1941
Milwaukee Road14B6943810/1941
Rock Island6216943911/1941
New Haven0700-070369726-6972912/1941
New Haven0704697301/1942
New Haven0705697312/1942
New Haven0706697323/1942
New Haven0707-070969733-697354/1942
Gulf, Mobile & Ohio272699912/1943
New Haven0710-071969980-699897/1942-1/1943
New Haven0720-072971041-710501/1944-4/1944
New Haven0730-073972950-7295910/1944-1/1945
New Haven0740-074472925-729291/1945-2/1945
New Haven0745-075971439-714532/1945-4/1945
Southern2904699909/1942

DL-110

Railroad Road Number Construction Number Completion Date
Santa Fe50A694405/1/1941
Southern (Cincinnati, New Orleans & Texas Pacific)6400B694412/1941
Southern (Cincinnati, New Orleans & Texas Pacific)6401B694423/1941
Southern (Cincinnati, New Orleans & Texas Pacific)6401C6944311/1941
6920938726277283716182983997384.jpgSanta Fe's only DL-109/DL-110 set (#50-L/#50-A) is seen here stored at Argentine Yard (Kansas), circa 1960. American-Rails.com collection.

Interestingly, the Milwaukee Road is said to have used their DL-109s in service until the mid-1960s, logging more than 3 million and was rebuilt at least once and sported an Electro-Motive cab giving it the appearance as a GM-product. 

The table listed above highlights each DL model and their total sales numbers.   From a sales standpoint the DL series would be considered rather unsuccessful selling only 74 "A" and 4 "B"  units total.  This was a microcosm of Alco's problems with main line passenger and freight diesel locomotives.

Railroads often found the company's prime movers, particularly the 539T (which the DL-100 series was powered with), 241, and 244 models unreliable, troublesome, and rather complicated to maintain.

Even in later years when Alco developed a more reliable prime mover, the model 251, it appears the damage was already done among railroads, with most shying away from purchasing later models.  

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Sources

  • Kirkland, John F. Diesel Builders, The:  Volume Two, American Locomotive Company And Montreal Locomotive Works. Glendale: Interurban Press, 1989.
  • Pinkepank, Jerry A. Diesel Spotter's Guide.  Milwaukee: Kalmbach Publishing Company, 1967.
  • Schafer, Mike. Vintage Diesel Locomotives. Osceola: MBI Publishing, 1998.
  • Solomon, Brian. Alco Locomotives. Minneapolis: Voyageur Press, 2009.
  • Solomon, Brian. American Diesel Locomotive, The. Osceola: MBI Publishing, 2000.