ALCo MILW S3

Built by ALCo

Track gauge

1,435 mm

Standard gauge

Axle arrangement

2’D2’ h2

Overview of the ALCo MILW S3

Discover the powerful MILW S3 steam locomotive,

a true icon of American railroading.

This impressive 4-8-4 Whyte notation engine boasts a rich history with the Chicago, Milwaukee, St. Paul and Pacific Railroad.

Built by ALCo, the MILW S3 is a testament to robust engineering, featuring a 1435 mm gauge track width and a substantial tractive effort of 276 kN. Its 2’D2’ h2 UIC axle configuration highlights its design for heavy hauling and efficient operation.

Explore the legacy of this magnificent steam locomotive and its significant role in transportation history.

ALCo MILW S3 technical specifications

	Value	Imperial / US
Built by	ALCo
Tractive effort	276 kN62,047 lbf	62,047 lbf
Track gauge	1,435 mmStandard gauge4 ft 8½ in	4 ft 8½ in
UIC axle arrangement	2’D2’ h2
Whyte notation	4-8-4