Alco/MLW S3 Somebody's Large Digital 
Image Here
Revised: 2 November 2020 photo by: R. Craig
- Info from: John Komanesky
Original owner Road Numbers Qty. Bldr Numbers Bldr Dates
Aluminum Co. of America - ALCOA 8 1 79534 2/1952
Ann Arbor 4-7 4 78400-78403 11/1950
Boston & Maine 1173, 1174 2 78318, 78319 9/1950
1175, 1176 2 78391, 78392 9/1950
1177 - 1179 3 79539-79541 2-3/1952
1180 1 79767 3/1952
1181 - 1184 4 79770-79773 4-5/1952
1185 - 1188 4 80051-80054 5-6/1952
Brooks-Scanlon 101, 102 2 79538, 79774 2, 5/1952
Champion Paper 2104 1 79535 1/1952
Chicago & North Western 1262, 1263 2 78529, 78530 6/1951
1264, 1265 2 78781, 78782 7/1951
1266, 1267 2 78783, 78784 8/1951
Davenport Rock Island & Northwestern 1, 2 2 79532, 79533 12/1951, 1/1952
3, 4 2 80056, 80057 8/1952
5-7 3 80292-80294 9,10, 11/1953
Davidson Chemical Division-W.R. Grace 101 1 78786 8/1951
El Dorado & Wesson 18 1 80058 7/1952
Ford Motor Co. 6605, 6606 2 77780, 77781 2/1950
6607, 6608 2 77786, 77787 2, 3/1950
6609 - 6611 3 78396-78398 10/1950
Frederick Snare Corp. 7 1 79354 11/1951
General Portland Cement 1 1 78528 6/1951
Graysonia Nashville & Ashdown 51 1 78785 8/1951
Greater Portland Public Development Corp. 661 1 78393 10/1950
Humble Oil 997 1 78399 11/1950
Louisville & Nashville 69 - 75 7 77479-77485 4/1953
Maine Central 961, 962 2 80290, 80291 3/1953
Mount Hood RR 50 1 78317 9/1950
New York Central 874 - 891 18 78141-78158 6-8/1950
892 - 899 8 78221-78228 8/1950
900, 901 2 78229, 78230 9/1950
902, 903 2 78315, 78316 9/1950
904 - 906 3 78787-78789 9/1951
907 - 911 5 78791-78795 9-10/1951
912 - 914 3 79351-79353 11/1951
915, 916 2 79355, 79356 12/1951
Pennsylvania 8873, 8874 2 78404, 78405 11/1950
8875 - 8878 4 78506-78509 11-12/1950
8879 - 8885 7 78511-78517 12/1950-3/1951
Solvay Processing Div.-Allied Chemical 2 1 79769 4/1952
Southern Pacific 1023 - 1032 10 78518-78527 3-5/1951
Swift & Co. 664 1 78790 9/1951
Texas & Northern 3, 4 2 79536, 79537 1/1952
Texas City Terminal 32 1 78510 11/1950
Texas Co.(Texaco) 21, 22 2 79768, 80055 3, 7/1952
Washington Idaho & Montana 30 1 78395 10/1950
West Pittston-Exeter 6 1 78394 10/1950
CANADA (built by MLW)
Bathhurst Power & Paper 3 1 77281 12/1953
Canadian Arsenals 1 1 77280 11/1952
Canadian National 8450 - 8461 12 77757-77768 11/1951-3/1952
8462 - 8468 7 77283-77289 12/1952-3/1953
8469 - 8483 15 79129-79143 5-11/1953
8484 - 8493 10 76433-76442 3-6/1954
8494 - 8498 5 80981-80985 6-8/1954
Canadian Pacific 6500 - 6505 6 77635-77640 4-5/1951
6506 - 6512 7 77769-77775 3-5/1952
6513 - 6517 5 79116-79120 6-8/1952
6518 - 6522 5 79164-79168 9-10/1953
6523 - 6526 4 80987-80990 1/1955
6527 - 6535 9 81072-81080 2-3/1955
6536 1 81171 3/1955
6537 - 6547 11 81193-81203 7-8/1955
6548 - 6557 10 81505-81514 4-5/1956
6558 - 6561 4 81545-81548 5-6/1956
6562 - 6571 10 81663-81672 2-3/1957
6572 - 6588 17 82158-82174 3-6/1957
6589 - 6600 12 82175-82186 7-9/1957
Essex Terminal 103 1 77282 12/1952
LaSalle Coke 4 1 80986 6/1954
National Harbours Board D2 - D4 3 77641-77643 5/1951
5 - 9 5 77752-77756 11/1951
Price Brothers (ex-MLW demonstrator on CPR as #7004) 106 1 77634 9/1950

Sources of information: Extra 2200 South, Diesel Era, The Short Line and The Canadian Trackside Guide.

Additional info provided by R. Craig.


Alco S3 Somebody's Large Digital Image Here
Data Sheet and drawing by: JEAN-DENIS BACHAND
-- --
New: 12 Oct. 2017 Drawing by: Jacques Belanger
-
Engine Builder: Alco Engine: 4-cycle Model 539 6L
Bore & Stroke 12.5" X 13.0"
RPM (Maximum / Minimum) 740 / 315
Main Generator: GE - GT552A Horsepower: S3: 660
Gear Ratio: 74:18 Speed: 60 mph
Trucks: Blunt 4-Wheel Configuration: B-B
Traction Motor Blowers: Mechanical Driven (2) Model: ?
Weight: 210,000 lbs Traction Motors: GE 731 (four)
Tractive Effort (starting) 52,500 @ 25% (S-1) Tractive Effort (continuous): 41,900 lbs @ 5 mph
Multiple Unit Capability: No Dynamic Braking: Yes
Auxilary Generator: GE SMG139 Alternator: --
Air Brake: Westinghouse Model: 14EL
Compressor: Westinghouse Model: 3CD
Boiler Type: -- Lbs/hr: --
Quantity Built: 127 (S-3) (Dates 6/1950 to 10/1953)
- -
Total Length 44'-05"
Pilot to Pilot 36'-00"
Wheel Diameter 40"
Truck Wheel Base 8'-00"
Height to Top Engine Hood 12'-01"
Height to Top Cab Hood 14'-05"
Cab Width 10'-00"
Walkway Width 4'-01"
Engine Hood Width 6'-10"
Center Bolster 22'-00"
Center Front Truck to Front Pilot 7'-00"
Center Rear Tucrk to Rear Pilot 7'-00"
Distance between Truck Centers 30'-00"
Minimum Turning Radius 39 degrees
- -
Fuel Oil: 635 Lubricating Oil: 80
Engine Cooling Water: 200 Sand Capacity: 27 cu. ft.
Options: Dynamic Brakes
  • Air Signal Lines
  • Hump Control
  • Stanley Heater
- -
Drawing by: Jean-Denis Bachand
Reference Sources:
  • Alco Design Data
  • Canadian Pacific Mechanical Data
  • Erie Lackawana Mechanical Data

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