ALCo S4

Built by ALCo

Power output

746 kW

1,000 hp

Length

13.86 m

45 ft 6 in

Track gauge

1,435 mm

Standard gauge

Years built

1949–1961

797 units

Axle arrangement

Bo'Bo'

Overview of the ALCo S4

Discover the ALCo S4 diesel locomotive, a powerful workhorse with 746 kW output.

Manufactured by ALCo between 1949 and 1961, this standard gauge (1435 mm) locomotive has a rich history with renowned railway companies like the Atchison, Topeka and Santa Fe Railway, Baltimore and Ohio Railroad, and Canadian Pacific Railway.

Measuring 13.86 meters in length, 3.05 meters in width, and 4.42 meters in height, the S4 boasts robust dimensions for reliable service.

With its Bo'Bo' axle classification, the S4 proved to be a versatile locomotive, adept at both freight and passenger duties, as evidenced by its extensive career and numerous available photographs.

A true icon of American and Canadian railway engineering, the S4 represents a significant era in locomotive development.

ALCo S4 technical specifications

	Value	Imperial / US
Series	ALCo S2-S4
Built by	ALCo · 1949–1961797 units
Power output	746 kW1,000 hp	1,000 hp
Prime mover	ALCo 539T S6
Track gauge	1,435 mmStandard gauge4 ft 8½ in	4 ft 8½ in
UIC axle arrangement	Bo'Bo'
Length	13.86 m45 ft 6 in	45 ft 6 in
Width	3.05 m10 ft 0 in	10 ft 0 in
Height	4.42 m14 ft 6 in	14 ft 6 in

Source of the data: en.wikipedia.orgView this model on trainspo.com Spotted an error? Let us know

Operators of the ALCo S4

Railway companies that have operated the S4, with the class designation used by each of them.

Operator	Class	Country
Canadian Pacific Railway	CP S4	Canada
Atchison, Topeka and Santa Fe Railway	ATSF S4	United States
Baltimore and Ohio Railroad	B&O S4	United States
Tacoma Rail	TMBL S4	United States