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ALCO S-1 and S-3

ALCO S-1 and S-3
MCRY 7 20041010.jpg
Mid-Continent Railway No. 7, an S-1, rests between trains on October 10, 2004
Type and origin
Power type Diesel
Builder
Build date
  • April 1940–June 1950 (S-1)
  • February 1950–November 1953 (S-3)
Total produced
  • 543 (S-1)
  • 300 (S-3)
Specifications
Configuration:
 • AAR B-B
Gauge 4 ft 8 12 in (1,435 mm)
Trucks
  • Blunt (S-1)
  • AAR type A (S-3)
Wheel diameter 40 in (1,000 mm)
Minimum curve 50°
Wheelbase 30 ft (9.14 m)
Length 45 ft (14 m)
Width 10 ft 2 12 in (3.112 m)
Height 14 ft 4 38 in (4.378 m)
Loco weight 199,000 lb (90,000 kg)
Fuel capacity 635 US gal (2,400 L)
Prime mover Alco 539
Engine type Four-stroke diesel
Aspiration Natural
Displacement 9,572 cu in (156.86 l)
Generator GE GT 552-A
Traction motors 4 × GE 731
Cylinders Straight 6
Cylinder size 12 12 in × 13 in (318 mm × 330 mm)
Performance figures
Power output 660 hp (490 kW)
Tractive effort 49,790 lb (22,580 kg)
Career
Locale North America, Brazil, United Kingdom
Type and origin
Power type Diesel
Builder
Build date
  • April 1940–June 1950 (S-1)
  • February 1950–November 1953 (S-3)
Total produced
  • 543 (S-1)
  • 300 (S-3)
Specifications
Configuration:
 • AAR B-B
Gauge 4 ft 8 12 in (1,435 mm)
Trucks
  • Blunt (S-1)
  • AAR type A (S-3)
Wheel diameter 40 in (1,000 mm)
Minimum curve 50°
Wheelbase 30 ft (9.14 m)
Length 45 ft (14 m)
Width 10 ft 2 12 in (3.112 m)
Height 14 ft 4 38 in (4.378 m)
Loco weight 199,000 lb (90,000 kg)
Fuel capacity 635 US gal (2,400 L)
Prime mover Alco 539
Engine type Four-stroke diesel
Aspiration Natural
Displacement 9,572 cu in (156.86 l)
Generator GE GT 552-A
Traction motors 4 × GE 731
Cylinders Straight 6
Cylinder size 12 12 in × 13 in (318 mm × 330 mm)
Performance figures
Power output 660 hp (490 kW)
Tractive effort 49,790 lb (22,580 kg)
Career
Locale North America, Brazil, United Kingdom

The ALCO S-1 and S-3 were 660 horsepower (490 kW) switcher diesel-electric locomotives produced by ALCO and their Canadian subsidiary Montreal Locomotive Works (MLW). Basically, the two locomotives differed only in trucks, with the S-1 using ALCO's own Blunt trucks, and the S-3 riding on standard AAR type A switcher trucks. The S-1 was built between April 1940 and June 1950, with a total of 543 completed, while the S-3 was constructed between February 1950 and November 1953 (MLW until 1957) with total sales of 300. A modified version, the S-10, was built by MLW only; 13 were built between January and June 1958.

The S-1 and S-3 are distinguishable externally from the very similar S-2 and S-4 1,000 horsepower (750 kW) switchers in that they have a smaller exhaust stack with a round base and a smaller radiator shutter area on the nose sides. The S-1/S-3 radiator shutter area is taller than it is wide, while the S-2/S-4 radiator area is wider. The smaller stack is due to the lack of turbocharging.

The S-10 is not externally distinguishable from later Canadian-built S-3 locomotives; it differed mostly in electrical equipment.

The S-1 and S-3 models were sold to an extensive list of railroads and industrial operators, as detailed below. Major owners of the S-1 included the New York Central Railroad (NYC), with 71 locomotives; the New Haven with 65 locomotives; the L&N with 45 locomotives; the C&NW, with 29 locomotives; and the Pennsylvania Railroad (PRR) with 27 locomotives. Major customers for the S-3 included the CP, with 101; the CN, with 49; the NYC, with 43 locomotives; the B&M, with 16; and the PRR, with 13. The MLW S-10 was sold only to the CP.


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