Spokane Falls & Northern / Watertown & Sioux Falls / Great Northern 2-6-0 "Mogul" Type Locomotives

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Class Details by Steve Llanso

Class D-1 (Locobase 7460)

Data from GN 1916 Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers were 9968 in April 1889, 9972 in May, and

10036-10037 in June.

See http://www.historyink.org/index.cfm?DisplayPage=output.cfm&file_id=7528, for the HistoryLink essay by John R Fahey reprinted from The Pacific Northwesterner, Vol 4, No 2 (Spring 1960), pp. 17-26

These were relatively small and light Moguls had the lowest numbers on the SF & N. This railroad was one of several promoted and built by Daniel J Corbin. Says Fahey: "...his roads opened the mines of northern Idaho, and provided the first direct rail contact to the mining districts near Nelson and Rossland, British Columbia." In building the SF & N in 1889-1890, Corbin instructed his chief engineer (Roberts) to build it cheap and build it fast.

Although the 4 moguls were delivered in May 1889, many trials (including a widespread fire in Spokane in August) had to be endured before the first timetable was published on 1 September 1889. Three of them served the SF & N until it was absorbed by the Great Northern; the last operated on the Vancouver, Westminster & Yukon in British Columbia 0 another Corbin railroad.

Although the finished line was quite successful, it could not resist the money flashed by larger roads. In 1898, the Northern Pacific bought the SF & N, but sold it two years later to the Great Northern. When the GN took over the motive power in 1907, it classed all 4 as D-1.

Class D-2 (Locobase 7458)

Data from GN 1916 Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive collection.

Within a few years of completing the railway, the GN ordered a large batch of Moguls to work the freight. This numerous class had lost very few units by the time the 1916 diagram book was compiled. By 1929, however, the entire class seems to have been retired.

321 of the class was sold in January 1928 to Canada's Midland of Manitoba, where it was given number 1.

Class D-4 (Locobase 2853)

Data from GN 1916 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

A low-slung Mogul with a Belpaire firebox displayed at 1893 Columbian Exposition. Although 351 was the number on the cab, that number belonged to an earlier Rogers class of D-2 Moguls of similar dimensions (342-359) that was supplied in 1891.

Class D-5 (Locobase 2615)

Data from 1899 Brooks Catalogue.

Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004.

Works #2698-2709 in September 1896, 2788-2797 in August 1897. In addition 2798-2802 were delivered in the same month to the Eastern Railway of Minnesota with road #256-260.

Very close in size (heating surface area, tube length, number of tubes) to Brooks' delivery to the Buffalo, St. Mary, and SouthWestern RR. The grate area for the Belpaire firebox was even less, however.

In 1899, the whole class was renumbered 450-476 and the ERM's 5 became Great Northern when the railway was absorbed in 1902. Several were sold for scrap beginning in the late 1920s and ending in 1940, but three went to a Canadian railway. Two -- 460 & 458 -- had the same Midland Railway of Manitoba road number. Another -- 457 -- was number 5. This locomotive had earlier been converted to an 0-6-0 switcher (as were several others in the class) but was reunited with a leading truck before its sale to the Midland

Class D-6 (Locobase 7462)

Data from GN 1916 Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive collection.

This W & SF Mogul had fewer boiler tubes than did the earlier Schenectady engine, but somewhat taller drivers. All the 2-6-0s for this small component of the Great Northern were among the smallest of the type in US service.


Specifications by Steve Llanso
ClassD-1D-2D-4D-5D-6
Locobase ID7460 7458 2853 2615 7462
RailroadSpokane Falls & Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)Watertown & Sioux Falls (GN)
Whyte2-6-02-6-02-6-02-6-02-6-0
Road Numbers1-4/ 477-480300-359400-426371-92 / 450-47612
GaugeStdStdStdStdStd
BuilderBurnham, Parry, Williams & CoRogersBrooksBrooksSchenectady
Year18891887189318961906
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase15.33'15.08'14'14'14'
Engine Wheelbase22.92'22.75'21.50'21.50'21.08'
Ratio of driving wheelbase to overall engine wheebase 0.67 0.66 0.65 0.65 0.66
Overall Wheelbase (engine & tender)43.50'47'48.17'48.33'45.83'
Axle Loading (Maximum Weight per Axle)25666 lbs26060 lbs37933 lbs
Weight on Drivers77000 lbs78200 lbs108000 lbs114000 lbs113800 lbs
Engine Weight90000 lbs99800 lbs119900 lbs130000 lbs
Tender Light Weight72000 lbs68000 lbs86000 lbs85000 lbs71500 lbs
Total Engine and Tender Weight162000 lbs167800 lbs205900 lbs215000 lbs
Tender Water Capacity3000 gals3000 gals4000 gals4000 gals3600 gals
Tender Fuel Capacity (oil/coal)9 tons5 tons8 tons8.5 tons5 tons
Minimum weight of rail (calculated) on which locomotive could run43 lb/yard43 lb/yard60 lb/yard63 lb/yard63 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter55"55"55"55"55"
Boiler Pressure145 psi150 psi180 psi180 psi150 psi
Cylinders (dia x stroke)18" x 24"19" x 24"19" x 24"19" x 26"19" x 24"
Tractive Effort17425 lbs20085 lbs24102 lbs26110 lbs20085 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42 3.89 4.48 4.37 5.67
Heating Ability
Firebox Area134.98 sq. ft117.80 sq. ft129.30 sq. ft151 sq. ft143 sq. ft
Grate Area16.94 sq. ft18.98 sq. ft21.50 sq. ft21.10 sq. ft25.50 sq. ft
Evaporative Heating Surface1310 sq. ft1309 sq. ft1364 sq. ft1601 sq. ft1610 sq. ft
Superheating Surface
Combined Heating Surface1310 sq. ft1309 sq. ft1364 sq. ft1601 sq. ft1610 sq. ft
Evaporative Heating Surface/Cylinder Volume185.33166.21173.19187.64204.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation24562847387037983825
Same as above plus superheater percentage24562847387037983825
Same as above but substitute firebox area for grate area1957217670232742718021450
Power L137323314421245564059
Power MT320.56280.29257.94264.32235.90

Reference

Credits

Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.