ALCO S-1 and S-3

Specifications
Specifications
Configuration:;
• AAR	B-B
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Trucks	Blunt (S-1); AAR type A (S-3);
Wheel diameter	40 in (1,016 mm)
Minimum curve	50° (118.31 ft or 36.06 m)
Wheelbase	30 ft (9.14 m)
Length	45 ft (13.72 m)
Width	10 ft 2+1⁄2 in (3.112 m)
Height	14 ft 4+3⁄8 in (4.378 m)
Loco weight	199,000 lb (90,000 kg)
Fuel capacity	635 US gal (2,400 L; 529 imp gal)
Prime mover	Alco 539T
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+1⁄2 in × 13 in (318 mm × 330 mm)

Type and origin
Type and origin
Power type	Diesel
Builder	American Locomotive Company; Montreal Locomotive Works;
Build date	April 1940–June 1950 (S-1); February 1950–November 1953 (S-3);
Total produced	543 (S-1); 300 (S-3);

ALCO S-1 and S-3
ALCO S-1 and S-3
	Mid-Continent Railway No. 7, an S-1, rests between trains on October 10, 2004
Power type
Type and origin
Power type	Diesel
Builder	American Locomotive Company; Montreal Locomotive Works;
Build date	April 1940–June 1950 (S-1); February 1950–November 1953 (S-3);
Total produced	543 (S-1); 300 (S-3);
Configuration:;
Specifications
Configuration:;
• AAR	B-B
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Trucks	Blunt (S-1); AAR type A (S-3);
Wheel diameter	40 in (1,016 mm)
Minimum curve	50° (118.31 ft or 36.06 m)
Wheelbase	30 ft (9.14 m)
Length	45 ft (13.72 m)
Width	10 ft 2+1⁄2 in (3.112 m)
Height	14 ft 4+3⁄8 in (4.378 m)
Loco weight	199,000 lb (90,000 kg)
Fuel capacity	635 US gal (2,400 L; 529 imp gal)
Prime mover	Alco 539T
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+1⁄2 in × 13 in (318 mm × 330 mm)
Power output
Performance figures
Power output	660 hp (490 kW)
Tractive effort	49,790 lb (22,580 kg)
Locale
Career
Locale	North America, Brazil, United Kingdom

The ALCO S-1 and S-3 were 660 horsepower (490 kW) diesel-electric switcher locomotives produced by ALCO and their Canadian subsidiary Montreal Locomotive Works (MLW). The two locomotives differed only in trucks, with the S-1 using ALCO's own Blunt trucks, and the S-3 using 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.

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