The reference for locomotives and railcars


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Chicago & North Western class D
United States | 1900 | 91 produced
No. 1088 in March 1936 in Milwaukee, Wisconsin
No. 1088 in March 1936 in Milwaukee, Wisconsin
Howard Locomotive Photographs

The class of the D Chicago & North Western was one of the first Atlantics with a wide firebox. With this arrangement, it was quickly discovered that firing was much easier and that much power could even be delivered with inferior coal. Production consisted of a first variant, of which 77 were built between 1900 and 1907, and another, of which 14 were built in 1908.

The first variant had an inside Stephenson valve gear with valves that were also inside the frame. The last ten of the second variant were built with a Walschaert valve gear and Young rotary valves.

The locomotives pulled trains, usually consisting of ten, sometimes eleven cars. 74 were later retrofitted with a superheater. When the wooden cars were replaced with steel cars and more powerful express locomotives were introduced, the class D was used in commuter and local traffic. Almost all locomotives survived into the late 1930s, 15 even survived into the late 1940s.

Variant1900 variant1908 variantsuperheated
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase26 ft 9 in
Fixed wheelbase7 ft
Total wheelbase57 ft 11 1/2 in58 ft 7 in57 ft 11 1/2 in
Service weight158,000 lbs183,000 lbs181,500 lbs
Adhesive weight91,000 lbs95,000 lbs97,500 lbs
Total weight298,000 lbs327,300 lbs325,500 lbs
Axle load45,500 lbs47,500 lbs48,750 lbs
Water capacity7,500 us gal
Fuel capacity20,000 lbs (coal)
Power sourcesteam
Estimated power1,575 hp (1,174 kW)1,800 hp (1,342 kW)
Optimal speed45 mph46 mph53 mph
Starting effort22,100 lbf21,827 lbf
Power Plant
Driver diameter80 in81 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 20 x 26 in
Grate area46.3 sq ft
Firebox area199 sq ft197.1 sq ft199 sq ft
Tube heating area2,817 sq ft2,758.9 sq ft1,975 sq ft
Evaporative heating area3,016 sq ft2,956 sq ft2,174 sq ft
Superheater area439 sq ft
Total heating area3,016 sq ft2,956 sq ft2,613 sq ft
Calculated Values
steam locomotive
last changed: 01/2024

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