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Steam locomotive

ALCo 4-6-6-4

Built by ALCo

Top speed
70 km/h
43 mph
Track gauge
1,435 mm
Standard gauge
Years built
1936–1944
105 units
Axle arrangement
4-6-6-4

Overview of the ALCo 4-6-6-4

Explore the powerful 4-6-6-4 steam locomotive, a marvel of engineering built by ALCo between 1936 and 1944.

This impressive steam engine boasts a gauge of 1435 mm and can reach speeds of up to 70 km/h, showcasing the technological prowess of its era.

Its unique 4-6-6-4 Whyte notation signifies an articulated design that allowed for a significant tractive effort of 433 kN, making it ideal for heavy hauling.

A captivating piece of railway history, the 4-6-6-4 is a must-see for any steam locomotive enthusiast.

ALCo 4-6-6-4 technical specifications

Value
Built byALCo · 1936–1944105 units
Top speed70 km/h43 mph
Tractive effort433 kN97,342 lbf
Track gauge1,435 mmStandard gauge4 ft 8½ in
Whyte notation4-6-6-4

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