Alco "S-3" Locomotives
The Alco S3 was the third model of switcher in its "S" line that the company produced. It was virtually identical to the previous S1 model
that was built from 1940 through 1950 and its interesting that American Locomotive even elected to change the unit's
name given their striking similarities.
The S3 design was not quite as
successful as the S1, selling about half as many units. However, it
was purchased by several Canadian lines through Alco's Montreal
Locomotive Works located in Montreal, Quebec.
The S1 was never offered in Canada while the S2 did witness several buyers, notably via Canadian National and Canadian Pacific. This continued with the S3 as both Class I's acquired even more of that particular model.
Today, the S3 is perhaps the least preserved of the switcher series but several are extant. At least three American-built examples are operational, Alexander Railroad #6 and #7 (of New York Central and Davenport, Rock Island & Western heritage) as well as Dardanelle & Russellville #18. In additional, several Canadian examples are preserved.
Classic car aficionados will surely enjoy this scene of Ford Motor Company S3 #6610 shunting a carload of new Mustangs (among a wide range of other cool models!) at its River Rouge Plant in Dearborn, Michigan circa 1965.
The Alco S3 model rolled into production in February, 1950, which was about four months before the final S1 rolled out of the builder's Schenectady, New York plant.
deviated a bit from its earlier counterpart in that it was equipped
with the more standard AAR trucks, while the S1 and S2 designs featured
Alco's very own Blunt trucks (the manufacturer was one of the only major
builders of diesel locomotives to design its own trucks).
Like the S1,
the S3 was a standard four-axle design featuring traction motors from
General Electric and air
components (brakes and compressors) from Westinghouse. Both featured
dynamic braking, weighed 105 tons, and carried a length of just over 44
Canadian National #8483, a Montreal-built S3, switches a passenger consist at the London, Ontario station on July 4, 1966. Roger Puta photo.
However, the S3 also differed in some other ways as well. While both models
offered a continuous tractive effort rating of around 46,000 pounds the
S3 featured more starting effort, 59,700 pounds (compared to the S1's
Additionally, the most noticeable difference,
internally, was that the S3 included 660 horsepower whereas the S1 was
slightly less powerful at just 600 horsepower.
Most likely the S3 sold
fewer units than the S1 for a few reasons; first, railroads were
probably looking for a more powerful switcher, which was already
available in the S2; and second, aside from the S2, those that wanted
the extra power had a second chance at doing so with the S4 (which
replaced the S2).
With Buffalo Central Terminal looming in the background, Penn Central S-3 #9365 (ex-New York Central #895) carries out switching duties on December 20, 1969. Roger Puta photo.
In the end the Alco S3 sold just 292 units. Interestingly, though, a wide range of railroads and industries purchased the model
like the Pennsylvania, Chicago & North Western, Southern Pacific,
Ann Arbor, New York Central, and others.
The Montreal Locomotive Works
built S3s for Bathhurst Power & Paper,
Canadian Arsenals, Canadian National, Canadian Pacific, Essex Terminal,
LaSalle Coke, and National Harbours Board.
The MLW demonstrator was
purchased by the Price Brothers (it was later picked up by CP).
Overall, MLW constructed 163 S3's with CP and CN buying the majority of
Alco S3 Data Sheet
|Entered Production||2/1950 (Ford Motor Company #6605)
|Engine||539, 6-Cylinder In-Line
|Length (Between Coupler Pulling Faces)||45' 5.75"
|Height Above Rail Head||14' 6"
|Truck Type||GRS Rigid Bolster, Drop-Side Equalizer (AAR Type-A)
|Traction Motors||GE 731 (4)
|Tractive Effort Rating||46,000 Lbs. at 5 MPH.
|Top Speed||60 MPH
During the course of production the S-3 switched from a short to long-shank coupler so the locomotive could more easily negotiate curves while pulling a cut of cars.
The final short-shank variant appeared on La Salle Coke #4 (construction number 80986) on June 11, 1954. In Canada the first switcher to feature a long-shank coupler was Canadian Pacific #6523 (construction number 80987) completed on January 17, 1955.
Alco S3 Production Roster
|Aluminum Company Of America (Alcoa)||8||1||1952|
|Ann Arbor Railroad||4-7||4||1950|
|Boston & Maine||1173-1188||16||1950-1952|
|Champion Paper Company||2104||1||1952|
|Chicago & North Western||1262-1267||6||1951|
|Davenport, Rock Island & Northwestern||1-7||7||1952-1953|
|Davison Chemical, W.R. Grace & Company||101||1||1951|
|El Dorado & Wesson Railway||18||1||1952|
|Ford Motor Company||6605-6611||6||1950|
|Frederick Snare Corporation||7||1||1951|
|General Portland Cement||1||1||1951|
|Graysonia, Nashville & Ashdown Railroad||51||1||1951|
|Greater Portland Public Development Corporation||661||1||1950|
|Humble Oil & Refining Company||997||1||1950|
|Louisville & Nashville||69-75||7||1953|
|Manistique & Lake Superior Railroad||1||1||1950|
|Mount Hood Railroad||50||1||1950|
|New York Central||874-916||43||1950-1951|
|Swift & Company||664||1||1951|
|Texas & Northern||3-4||2||1952|
|Texas City Terminal||32||1||1950|
|Washington, Idaho & Montana Railway||30||1||1950|
|West Pittston-Exeter Railroad||6||1||1950|
MLW S3 Production Roster
|Bathurst Power & Paper||3||77281||1/1954|
|National Harbours Board||D2-D4||77641-77643||6/1951|
|National Harbours Board||D5-D9||77752-77756||8/1951-10/1951|
|La Salle Coke||4||80986||6/1954|
* First S-3 built by the Montreal Locomotive Works. It wore "Canadian Pacific #7004" as a demonstrator.
- Foster, Gerald. A Field Guide To Trains. New York: Houghton Mifflin, 1996.
- 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.
- Solomon, Brian. Alco Locomotives. Minneapolis: Voyageur Press, 2009.
Ann Arbor S3 #10 (ex-Manistique & Lake Superior #1) and a string of matching cabooses sit at the small yard in Owosso, Michigan during May of 1980. Note the poor condition of the track by this time. Rob Kitchen photo.
For a comprehensive look at the American Locomotive Company and all of the motive power types it built from steam, diesel, to electrics consider the book Alco Locomotives
by Brian Solomon.
Covering more than 175 pages Mr. Solomon's book
details the history of Alco from its esteemed 4-6-4 Hudsons and 4-6-6-4
Challengers to vaunted RS and PA series diesel locomotives.
If you have
any interest in Alco this book is a must have! Also consider Mike Schafer's Vintage Diesel Locomotives which looks at virtually all of the classic builders and models
from Alco PAs to early EMD Geeps.