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Northern Pacific classes W-3 and W-5
Spokane, Portland & Seattle class O-3
United States | 1913 | 160 produced
W-3 No. 1713 in January 1958 at Duluth, Montana
W-3 No. 1713 in January 1958 at Duluth, Montana
Twin Ports Rail History / Jeff Lemke

The W-3 class was created in 1913 as an enlarged successor to the W class. It was factory fitted with a superheater and, from the second batch, also with a combustion chamber. This made it possible to increase the train weight by almost 30 percent. 135 W-3s were built in 1913 and 1917 to 1920. Ten made it to the Spokane, Portland & Seattle where they became Class O-3. In 1922 another 25 W-5 followed, which were almost identical but had a higher boiler pressure.

VariantW-3W-5
General
Built1913, 1917-19201922
ManufacturerALCO
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase35 ft 3 in36 ft 3 in
Fixed wheelbase16 ft 6 in
Total wheelbase68 ft 2 in73 ft
Service weight320,000 lbs342,800 lbs
Adhesive weight240,500 lbs251,200 lbs
Total weight513,900 lbs545,100 lbs
Axle load64,400 lbs61,800 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Power
Power sourcesteam
Estimated power2,700 hp (2,013 kW)3,000 hp (2,237 kW)
Optimal speed30 mph
Starting effort57,120 lbf63,467 lbf
Power Plant
Driver diameter63 in
Boiler pressure180 psi200 psi
Expansion typesimple
Cylinderstwo, 28 x 30 in
Boiler
Grate area70.4 sq ft70.3 sq ft
Firebox area325 sq ft307 sq ft
Tube heating area3,266 sq ft3,285 sq ft
Evaporative heating area3,591 sq ft3,592 sq ft
Superheater area846 sq ft845 sq ft
Total heating area4,437 sq ft
Calculated Values
steam locomotive
freight
last changed: 07/2023
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