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Page views since 2023-01-26: 830323
Southern Pacific class M-4
United States | 1899
105 produced
No. 1701 in May 1935 in Los Angeles
No. 1701 in May 1935 in Los Angeles
collection Taylor Rush

A total of 105 of these Moguls were commissioned by the Southern Pacific beginning in 1899. They were from ALCO, most of them from Cooke and the rest from Schenectady. They were rebuilt from 1920 with a superheater. They were used in mainline service up until the 1940s and as switchers into the 1950s. Preserved today is number 1673, which is in Tucson, Arizona and has been optically refurbished since 2000.

Variantas builtsuperheated
General
Built1899-19011920-1922
ManufacturerCooke, ALCOSacramento
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase23 ft 3 in
Rigid wheelbase15 ft 2 in
Total wheelbase46 ft 8 1/2 in
Service weight142,600 lbs157,900 lbs
Adhesive weight123,700 lbs134,600 lbs
Axle load41,235 lbs44,870 lbs
Water capacity4,500 us gal
Fuel capacity20,000 lbs (coal)
Boiler
Grate area30.3 sq ft
Firebox area168 sq ft156 sq ft
Tube heating area1,947 sq ft1,350 sq ft
Evaporative heating area2,115 sq ft1,506 sq ft
Superheater area269 sq ft
Total heating area2,115 sq ft1,775 sq ft
Variantas builtsuperheated
Power Plant
Driver diameter63 in
Boiler pressure190 psi
Expansion typesimple
Cylinderstwo, 20 x 28 in
Power
Power sourcesteam
Estimated power850 hp (634 kW)1,100 hp (820 kW)
Optimal speed19 mph24 mph
Starting effort28,711 lbf
Calculated Values
steam locomotive
freight
last changed: 03/2023
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