Columbia & Red Mountain / Great Northern / Washington & Spokane Falls 2-8-0 "Consolidation" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 40/F-2 - compound (Locobase 8826)

Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 18, p. 13. Works numbers were 12817-12820, 12823 in July 1892.

In the same year that Brooks was delivering several dozen Consolidations to the GN (Locobase 2616), Baldwin supplied five tandem compounds of their own. These were bigger and had much larger grates in their Belpaire fireboxes. The difference came from a wide firebox that rode above the drivers. Piston valves measuring 10 1/2" (267 mm) in diameter supplied steam to the cylinders.

As with the Brooks engines, this quintet was soon simpled - see Locobase 8826.


Class 50 / F-5 (Locobase 8825)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Delivered right at the turn of the century, these Consolidations were typical of the breed. Locobase isn't sure, but suspects that they arrived as compounds and were later simpled. Note the usual Belpaire firebox, this time as part of a design that featured a long stroke.

Like many of the GN's earlier 2-8-0s, most were never superheated. Those that were appear in Locobase 8826.


Class 50A / F-7 (Locobase 8830)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

1901 saw the Great Northern purchase several classes of Consolidations from several builders. They shared many things: all came from manufacturers that would soon be gathered under the American Locomotive Company banner, all had Belpaire boilers, all had 55" drivers. Rogers' F-5 engines are shown in Locobase 8825 and the superheated F-6s originally supplied by Brooks appear in Locobase 8830.

These Cookes had 10 fewer boiler tubes than did the Rogers F-5s, but otherwise were quite similar. They were later superheated, the result of which is shown in Locobase 8831.


Class 50B / F-6 (Locobase 8849)

Data from Data from GN 1916 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

These long-stroke, Belpaire-boilered Consolidations continued the line of such 2-8-0s that began with the Rogers F-5 engines.


Class 51B / F-9 (Locobase 8850)

Data from Data from GN 1916 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

This class combined the basic power dimensions of Brooks's F-6 Consolidations (Locobase 8849) with a bigger grate in its Belpaire firebox. Most were superheated not long after they entered service; see Locobase 8851.


Class F-1 (Locobase 8823)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers 2093-2116 (road #450-473, renumbered 516-539 in 1899), 2133-2157 (474-499/540-565) in August-September 1892, and 2187-2201 (500-514) in November-December 1892.

This was a large class of Consolidations built by the Dunkirk, NY builder in less than six months. For a time, the boilers were pressed to 160 psi, but working pressure later rose to 185 psi as shown in the specs.

Locobase 2616 describes the tandem-compound layout installed in two Consolidations in 1892-1893. Those two engines were converted to simple-expansion in 1899.

504-505, 507, 509-510, 512, 527, and 535 were converted to oil-burning, using 3" (76.2 mm) burners. 505 trailed the smallest tender, a class D-2 carrying 1,990 US gallons (7,532 litres) of oil. Four used the F-1 or D-5 tender holding 3,020 gallons (11,437 litres) and two--512 and 527--used G-size tenders containing 3,454 gallons (13,073 litres).

A very few were superheated; see Locobase 8824.


Class F-1 - compound (Locobase 2616)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899).

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 number 2269 in April 1893 was shown at the Chicago World's Fair.

Tandem compound Consolidation that had less heating area than the Brooks Mogul delivered a couple of years later. It had an Improved Belpaire boiler. The HP cylinders received steam through piston valves while the larger LP cylinders immediately behind had D-type slide valves. The HP valve was driven through a link from the LP valve; the two travelled in opposite directions. HP valve travel was 4" (102 mm), LP travel was 7" (177 mm).

This pair was soon converted to the simple-expansion system already in use by the 64 other locomotives in this class; see Locobase 8823.


Class F-1-S (Locobase 8824)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Taking the basic simple-expansion F-1 rebuild described in Locobase 8823, the GN later superheated a few. Two had the layout shown in the specs, in which the 22 flues measured 5 1/2" in diameter; another had 5" flues, which held smaller elements and resulted in a 8-sq ft drop in superheater area. Other than the usual tradoff of tubes for flues, the installation of 10" (254 mm) piston valves, and a reduction in boiler pressure to 150 psi, a level more usually seen in the 1880s, the Belpaire-boilered F-1s were essentially the same.

The GN eventually reset the working pressure to 175 psi.


Class F-11 (Locobase 8832)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

The design is certainly foreign to the GN, having a round-topped boiler and small dimensions.


Class F-2 - simpled (Locobase 8827)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Other than taking off the two LP cylinders and enlarging the HP cylinders to 19" (483 mm), the GN made very few changes on these 5 Consolidations. The signature Belpaire firebox mated to a wide grate and an overall stubby look remained a part of the profile.

Four of the five were scrapped in June 1928; 596 didn't join them at the ferro-knacker's until September 1929.


Class F-4 (Locobase 8848)

Data from Data from GN 1916 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 20, p. 171. Works number was 15013 in August 1898.

This single Consolidation was owned by the Spokane Falls & Northern, but operated on the C&RM. The C&RM was a gold-mine creation in 1895 that ascended the Paterson valley in Stevens County from Northport to Rossland to exploit the Red Mountain gold strikes in northeastern Washington State.

In August 1898, the Great Northern gained control of the CR&M, buying it outright in July 1907. The GN renumbered the 9 as their 1094.

In July 1925, the GN sold 1094 to McGoldrick Lumber Company, then the most significant sawmill operation in the Spokane area and the city's largest industrial employer. (Spokane-Review's Bronzes, a "hall of fame" of good works, notes that James McGoldrick "...established innovative workplace safety programs".)


Class F-5-S (Locobase 8828)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Superheating the F-5s, first delivered in 1901 and shown in Locobase 8827, meant retaining the Belpaire firebox, but subtracting several dozen tubes to accommodate the odd-sized flues. It was apparently usual GN practice (but much less common elsewhere) to increase the cylinder diameter substantially at the same time; they were served by 12" piston valves.

At the time of the upgrade, the working boiler pressure was lowered to 175 psi, but it was later restored to 210 psi. When that occurred, the GN had a powerful little 2-8-0 indeed.


Class F-6-S (Locobase 8829)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

These Brooks machines were delivered in the same year as the F-5 came from Rogers (Locobase 8825) and the F-7s from Cooke (Locobase 8830). Like all Great Northern engines of the day, were fitted with a relatively narrow Belpaire firebox. They were superheated with one of two different designs; the GN's own installation yielded 444 sq ft compared the H & D equipment shown in the specs.

All of the class was converted to an 0-8-0 switcher layout.


Class F-7-S (Locobase 8831)

Data from Data from GN 1-1929 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

When the Great Northern superheated this set of Cooke-built Consolidations, they used the same layout as the F-5 superheating project described in Locobase 8828. At that point, the only difference was a lower adhesion weight in these F-7-S locomotives. Part of the upgrade consisted of dropping the working pressure to 165 psi. Unlike other 2-8-0 engines, however, these do not appear to have the original, higher working pressure restored later on.


Class F-8 (cross-compound) (Locobase 4129)

Data from 1901 Railroad Gazette (XXXIII, #24).

Part of the largest class of Consolidations on the Great Northern, these were the cross-compound variant. Notice the good ratio of high to low pressure, although these engines, like most US rigid compounds, probably were converted to simple-expansion F-8s not long after their introduction.


Class F-8 (simple) (Locobase 2801)

This was by far the largest class of Consolidations on the Great Northern. Baldwin, Brooks, and Rogers all supplied engines of this class. This entry shows the narrow-firebox, simple-expansion variant. Other engines in this class included some with a wide firebox (59 sq ft) and others were 2-cylinder cross-compounds. (See separate entries.) Data from 1901 Railroad Gazette (XXXIII, #24).

Some were superheated in the 1920s. According to Larry Bohn ([]), the engine in his photograph #1230 was completed by Baldwin in November 1907 and scrapped in 1954.


Class F-8 (wide firebox) (Locobase 4128)

Members of the largest class of Consolidations on the Great Northern, this variant was described in a 1901 Railroad Gazette (Vol XXXIII, #24) as part of a Rogers delivery along with two other variants. See the other F-8 entries.

Later Baldwin locomotives in this class are described in Locobase 13050.


Class F-8 (wide firebox) (Locobase 13050)

Data from DeGolyer, Volume 30, pp. 20-21. Works numbers were 32134-32137, 32148-32149, 32155-32159, 32183-32184, 32191-32193, 32212-32215, 32238-32245, 32266, 32291, 32295, 32297, 32299, 32302, 32314 in November 1907; 32332-32333, 32353, 32362-32363, 32391-32392, 32413, 32425-32426, 32464, 32478-32479, 32485, 32519 in December.

Locobase 4128 describes the Rogers engines that arrived on the GN as part of a large program of long-stroke Consolidations. Five years after the Rogers locomotives, Baldwin supplied this batch of 50, which had very similar specifications that differed only in the number of boiler tubes.

The last 10 were sold in 1909 to the Spokane, Portland & Seattle as their Class N-2, 355-364 (not numbered in order of boiler, alas). Three more GNs -- 1228, 1240, and 1253 -- joined the SP & S N-2 class in 1936. All remained in service into the mid-1950s.


Class F-8s-23 1/2"" cylinders (Locobase 6451)

According to the diagram reproduced on Ben Ringnalda's [] (visited 7 Jan 2005), this series of superheated F-8s included a variety of tube & flue layouts that resulted in slightly different surface areas. Most seem to have had the numbers shown in the specifications. Noteworthy to Locobase is the combination of retained Stephenson link motion and piston valves in a US engine that was refitted with superheaters. The piston valves measured a respectable 12" in diameter.

All had thirty 5" flues, but the surface area varied on the type of superheater, ranging from 448 sq ft as shown to 475 sq ft to 505 sq ft. Some had cylinder diameters of 23 1/2 inches (597 mm) as shown in this entry. Others had 26" cylinders. Some had arch tubes totalling 30 sq ft as part of the firebox heating surface, which increased the total to 225 sq ft.

The small-tube counts shown in the 12 survivors on Ringnalda's duplicated diagram show as follows:

Tubes Area

189 2,012

203 2,158

205 2,173

217 2,226

236 2,371

237 2,379


Class F-8s-26"" cylinders (Locobase 15815)

According to the diagram reproduced on Ben Ringnalda's [] (visited 7 Jan 2005), this series of superheated F-8s included a variety of tube & flue layouts that resulted in slightly different surface areas. Most seem to have had the numbers shown in the specifications. Noteworthy to Locobase is the combination of retained Stephenson link motion and piston valves in a US engine that was refitted with superheaters. The piston valves measured a respectable 12" in diameter.

All had thirty 5" flues, but the surface area varied on the type of superheater, ranging from 448 sq ft as shown to 475 sq ft (44.125 sq m). Some had cylinder diameters of 26 inches as shown in this entry. Others had 23 1/2" (597 mm) cylinders as shown in Locobase 6451. Some had arch tubes totalling 30 sq ft as part of the firebox heating surface, which increased the total to 225 sq ft.

The small-tube counts shown in the 12 survivors on Ringnalda's duplicated diagram show as follows:

Tubes Area

189 2,012

203 2,158

205 2,173

217 2,226

236 2,371

237 2,379


Class F-9-S (Locobase 8851)

Data from Data from GN 1916 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

When superheating was applied to this class's boilers, the railroad took the unusual step of greatly increasing the cylinder volume. The boiler's total heating surface remained approximately the same as did the grate in the Belpaire firebox.

It was too much of a good thing, most likely, given how little boiler there was for every cubic inch of cylinder. By the late 1920s, the GN had converted the whole class to C-3-S 0-8-0 switchers. Some had 21" cylinders, others 23 1/2".

Principal Dimensions by Steve Llanso of Sweat House Media
Class40/F-2 - compound50 / F-550A / F-750B / F-651B / F-9
Locobase ID8826 8825 8830 8849 8850
RailroadGreat Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class515102025
Road Numbers500-504/550-554/595-5991095-11091130-11391110-11291300-1324
GaugeStdStdStdStdStd
Number Built515102025
BuilderBurnham, Williams & CoRogersCookeAlco-BrooksAlco-Brooks
Year18921901190119011903
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.50 / 4.7215.50 / 4.7216 / 4.8816 / 4.8816 / 4.88
Engine Wheelbase (ft / m)23.33 / 7.1123.33 / 7.1124.25 / 7.3924.75 / 7.5425.17 / 7.67
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66 0.66 0.65 0.64
Overall Wheelbase (engine & tender) (ft / m)50.71 / 15.4650.71 / 15.4655.92 / 17.0453.92 / 16.4357.50 / 17.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)32,500 / 14,74244,750 / 20,29843,500 / 19,73144,525 / 20,19645,000 / 20,412
Weight on Drivers (lbs / kg)130,000 / 58,967179,000 / 81,193174,000 / 78,925178,100 / 80,785180,000 / 81,647
Engine Weight (lbs / kg)145,000 / 65,771194,000 / 87,997194,000 / 87,997195,500 / 88,677196,000 / 88,904
Tender Loaded Weight (lbs / kg)86,000 / 39,009137,000 / 62,142131,000 / 59,421125,400 / 56,881123,000 / 55,792
Total Engine and Tender Weight (lbs / kg)231,000 / 104,780331,000 / 150,139325,000 / 147,418320,900 / 145,558319,000 / 144,696
Tender Water Capacity (gals / ML)4000 / 15.156000 / 22.736000 / 22.736000 / 22.736000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.304000 / 15.2014 / 12.7012 / 10.9012 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 2775 / 37.5073 / 36.5074 / 3775 / 37.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 139755 / 139755 / 139755 / 139755 / 1397
Boiler Pressure (psi / kPa)160 / 11210 / 14.50210 / 14.50210 / 14.50210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)13" x 26" / 330x66020" x 32" / 508x81320" x 32" / 508x81320" x 32" / 508x81320" x 32" / 508x813
Low Pressure Cylinders (dia x stroke) (in / mm)22" x 26" / 559x660
Tractive Effort (lbs / kg)16,106 / 7305.5741,542 / 18843.1641,542 / 18843.1641,542 / 18843.1641,542 / 18843.16
Factor of Adhesion (Weight on Drivers/Tractive Effort) 8.07 4.31 4.19 4.29 4.33
Heating Ability
Firebox Area (sq ft / m2)193 / 17.94206 / 19.14206 / 19.14198.60 / 18.46217.30 / 20.20
Grate Area (sq ft / m2)53.90 / 5.0135.66 / 3.3135.66 / 3.3138.94 / 3.6257.50 / 5.34
Evaporative Heating Surface (sq ft / m2)2033 / 188.942795 / 259.762717 / 252.512828 / 262.832816 / 261.71
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2033 / 188.942795 / 259.762717 / 252.512828 / 262.832816 / 261.71
Evaporative Heating Surface/Cylinder Volume508.98240.21233.51243.05242.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation862474897489817712,075
Same as above plus superheater percentage862474897489817712,075
Same as above but substitute firebox area for grate area30,88043,26043,26041,70645,633
Power L138446328619963226456
Power MT260.76311.75314.17313.03316.29

Principal Dimensions by Steve Llanso of Sweat House Media
ClassF-1F-1 - compoundF-1-SF-11F-2 - simpled
Locobase ID8823 2616 8824 8832 8827
RailroadGreat Northern (GN)Great Northern (GN)Great Northern (GN)Washington & Spokane Falls (GN)Great Northern (GN)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class6664525
Road Numbers500-565499, 515508, 511-512, 544, 545 (2), 56414-15 / 590-591500-504 / 595-599
GaugeStdStdStdStdStd
Number Built64642
BuilderBrooksBrooksGNAlcoBaldwin
Year18921892191319121910
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.50 / 4.7215.50 / 4.7215.50 / 4.7214.83 / 4.5215.50 / 4.72
Engine Wheelbase (ft / m)23 / 7.0123 / 7.0123 / 7.0122.67 / 6.9123.33 / 7.11
Ratio of driving wheelbase to overall engine wheebase 0.67 0.67 0.67 0.65 0.66
Overall Wheelbase (engine & tender) (ft / m)50.17 / 15.2950 / 15.2450.17 / 15.2949.58 / 15.1150.71 / 15.46
Axle Loading (Maximum Weight per Axle) (lbs / kg)30,000 / 13,60830,000 / 13,60830,750 / 13,94832,500 / 14,742
Weight on Drivers (lbs / kg)120,000 / 54,431130,000 / 58,967120,000 / 54,431123,000 / 55,792130,000 / 58,967
Engine Weight (lbs / kg)136,000 / 61,689147,000 / 66,678136,000 / 61,689138,000 / 62,596145,000 / 65,771
Tender Loaded Weight (lbs / kg)86,000 / 39,00985,000 / 38,55586,000 / 39,009100,000 / 45,35986,000 / 39,009
Total Engine and Tender Weight (lbs / kg)222,000 / 100,698232,000 / 105,233222,000 / 100,698238,000 / 107,955231,000 / 104,780
Tender Water Capacity (gals / ML)4000 / 15.154000 / 15.154000 / 15.155000 / 18.944000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.308 / 7.308 / 7.309 / 8.208 / 7.30
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 2554 / 2750 / 2551 / 25.5054 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 139755 / 139755 / 139752 / 132155 / 1397
Boiler Pressure (psi / kPa)185 / 12.80180 / 12.40175 / 12.10180 / 12.40160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x66013" x 26" / 330x66022" x 26" / 559x66020" x 24" / 508x61019" x 26" / 483x660
Low Pressure Cylinders (dia x stroke) (in / mm)22" x 26" / 559x660
Tractive Effort (lbs / kg)26,835 / 12172.1718,120 / 8219.1034,034 / 15437.5828,246 / 12812.1923,209 / 10527.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47 7.17 3.53 4.35 5.60
Heating Ability
Firebox Area (sq ft / m2)176 / 16.36177 / 16.45176 / 16.36148 / 13.75193 / 17.94
Grate Area (sq ft / m2)24.60 / 2.2925.30 / 2.3524.60 / 2.2931.40 / 2.9253.90 / 5.01
Evaporative Heating Surface (sq ft / m2)1586 / 147.401596 / 148.331291 / 119.981807 / 167.942033 / 188.94
Superheating Surface (sq ft / m2)270 / 25.09
Combined Heating Surface (sq ft / m2)1586 / 147.401596 / 148.331561 / 145.071807 / 167.942033 / 188.94
Evaporative Heating Surface/Cylinder Volume185.89399.57112.86207.07238.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation45514554430556528624
Same as above plus superheater percentage45514554503756528624
Same as above but substitute firebox area for grate area32,56031,86036,03626,64030,880
Power L149013579645245535154
Power MT360.16242.78474.14326.43349.62

Principal Dimensions by Steve Llanso of Sweat House Media
ClassF-4F-5-SF-6-SF-7-SF-8 (cross-compound)
Locobase ID8848 8828 8829 8831 4129
RailroadColumbia & Red Mountain (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class152065
Road Numbers9/10941100-11041110-11291130-1133, 1136, 11381160-1164
GaugeStdStdStdStdStd
Number Built15
BuilderBurnham, Williams & CoGNAlco-BrooksGNRogers
Year18961913191319131901
Valve GearStephensonStephensonStephensonStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.42 / 3.7915.50 / 4.7216 / 4.8816 / 4.8816 / 4.88
Engine Wheelbase (ft / m)20.08 / 6.1223.33 / 7.1124.75 / 7.5424.25 / 7.3924.25 / 7.39
Ratio of driving wheelbase to overall engine wheebase 0.62 0.66 0.65 0.66 0.66
Overall Wheelbase (engine & tender) (ft / m)45.08 / 13.7450.71 / 15.4655.92 / 17.0455.92 / 17.0458 / 17.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)28,525 / 12,93944,750 / 20,29844,525 / 20,19643,500 / 19,731
Weight on Drivers (lbs / kg)113,300 / 51,392179,000 / 81,193178,100 / 80,785174,000 / 78,925174,000 / 78,925
Engine Weight (lbs / kg)135,000 / 61,235194,000 / 87,997195,500 / 88,677194,000 / 87,997195,000 / 88,451
Tender Loaded Weight (lbs / kg)82,000 / 37,195137,000 / 62,142137,000 / 62,142131,000 / 59,421
Total Engine and Tender Weight (lbs / kg)217,000 / 98,430331,000 / 150,139332,500 / 150,819325,000 / 147,418
Tender Water Capacity (gals / ML)3400 / 12.886000 / 22.736000 / 22.736000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.104000 / 15.2014 / 12.7014 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.5075 / 37.5074 / 3773 / 36.5073 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)47 / 119455 / 139755 / 139755 / 139755 / 1397
Boiler Pressure (psi / kPa)180 / 12.40210 / 14.50165 / 11.40165 / 11.40210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)19" x 24" / 483x61023.5" x 32" / 597x81323.5" x 32" / 597x81323.5" x 32" / 597x81322" x 32" / 559x813 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)33" x 32" / 838x813 (1)
Tractive Effort (lbs / kg)28,204 / 12793.1357,354 / 26015.3745,064 / 20440.7145,064 / 20440.7134,799 / 15784.58
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.02 3.12 3.95 3.86 5.00
Heating Ability
Firebox Area (sq ft / m2)171.25 / 15.91206 / 19.14198.60 / 18.46206 / 19.14212 / 19.70
Grate Area (sq ft / m2)24.82 / 2.3135.66 / 3.3134.94 / 3.2535.66 / 3.3135.30 / 3.28
Evaporative Heating Surface (sq ft / m2)1733 / 1612261 / 210.132554 / 237.362261 / 210.132712 / 252.04
Superheating Surface (sq ft / m2)505 / 46.93475 / 44.14505 / 46.93
Combined Heating Surface (sq ft / m2)1733 / 1612766 / 257.063029 / 281.502766 / 257.062712 / 252.04
Evaporative Heating Surface/Cylinder Volume220.04140.75158.99140.75385.25
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation44687489576558847413
Same as above plus superheater percentage44688837668869437413
Same as above but substitute firebox area for grate area30,82551,04738,01240,10844,520
Power L146369390736573784584
Power MT360.83462.60364.67373.92232.32

Principal Dimensions by Steve Llanso of Sweat House Media
ClassF-8 (simple)F-8 (wide firebox)F-8 (wide firebox)F-8s-23 1/2"" cylindersF-8s-26"" cylinders
Locobase ID2801 4128 13,050 6451 15,815
RailroadGreat Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class11410503310
Road Numbers1140-12531140-1160, 1165-1215-12641165, 1168, 1171, 1176, 1179, 1186-1187,1141, 1143, 1165, 1175, 1182-83, 1189-90, 1195-96
GaugeStdStdStdStdStd
Number Built1141050
BuilderseveralRogersBurnham, Williams & CoGNGN
Year19011901190719211921
Valve GearWalschaertWalschaertWalschaertStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)16 / 4.8816 / 4.8816 / 4.8816 / 4.8816 / 4.88
Engine Wheelbase (ft / m)24.25 / 7.3924.25 / 7.3924.25 / 7.3924.25 / 7.3924.25 / 7.39
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66 0.66 0.66 0.66
Overall Wheelbase (engine & tender) (ft / m)58 / 17.6858 / 17.6857.96 / 17.6755.92 / 17.0455.92 / 17.04
Axle Loading (Maximum Weight per Axle) (lbs / kg)45,000 / 20,41245,000 / 20,412
Weight on Drivers (lbs / kg)172,000 / 78,018172,000 / 78,018180,000 / 81,647180,000 / 81,647180,000 / 81,647
Engine Weight (lbs / kg)192,000 / 87,090192,000 / 87,090195,000 / 88,451195,000 / 88,451195,000 / 88,451
Tender Loaded Weight (lbs / kg)132,800 / 60,237123,000 / 55,792
Total Engine and Tender Weight (lbs / kg)327,800 / 148,688318,000 / 144,243
Tender Water Capacity (gals / ML)8000 / 30.306000 / 22.736000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)15 / 13.6012 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 3672 / 3675 / 37.5075 / 37.5075 / 37.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 139755 / 139755 / 139755 / 139755 / 1397
Boiler Pressure (psi / kPa)210 / 14.50210 / 14.50210 / 14.50180 / 12.40165 / 11.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 32" / 508x81320" x 32" / 508x81320" x 32" / 508x81323.5" x 32" / 597x81326" x 32" / 660x813
Tractive Effort (lbs / kg)41,542 / 18843.1641,542 / 18843.1641,542 / 18843.1649,160 / 22298.6355,162 / 25021.09
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.14 4.14 4.33 3.66 3.26
Heating Ability
Firebox Area (sq ft / m2)212 / 19.70200 / 18.59204 / 18.96195 / 18.12195 / 18.12
Grate Area (sq ft / m2)35.30 / 3.2859 / 5.4859 / 5.4859.20 / 5.5059.20 / 5.50
Evaporative Heating Surface (sq ft / m2)2712 / 252.042700 / 250.932728 / 253.532574 / 239.132441 / 226.77
Superheating Surface (sq ft / m2)475 / 44.13448 / 41.62
Combined Heating Surface (sq ft / m2)2712 / 252.042700 / 250.932728 / 253.533049 / 283.262889 / 268.39
Evaporative Heating Surface/Cylinder Volume233.08232.05234.45160.23124.14
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation741312,39012,39010,6569768
Same as above plus superheater percentage741312,39012,39012,36111,331
Same as above but substitute firebox area for grate area44,52042,00042,84040,71637,323
Power L162406121620180365729
Power MT319.93313.83303.80393.70280.67

Principal Dimensions by Steve Llanso of Sweat House Media
ClassF-9-S
Locobase ID8851
RailroadGreat Northern (GN)
CountryUSA
Whyte2-8-0
Number in Class2
Road Numbers1307+
GaugeStd
Number Built
BuilderGN
Year1913
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)16 / 4.88
Engine Wheelbase (ft / m)25.25 / 7.70
Ratio of driving wheelbase to overall engine wheebase 0.63
Overall Wheelbase (engine & tender) (ft / m)57.50 / 17.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)45,000 / 20,412
Weight on Drivers (lbs / kg)180,000 / 81,647
Engine Weight (lbs / kg)196,000 / 88,904
Tender Loaded Weight (lbs / kg)123,000 / 55,792
Total Engine and Tender Weight (lbs / kg)319,000 / 144,696
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)75 / 37.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 1397
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)26" x 32" / 660x813
Tractive Effort (lbs / kg)60,176 / 27295.41
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.99
Heating Ability
Firebox Area (sq ft / m2)217.30 / 20.20
Grate Area (sq ft / m2)57.50 / 5.34
Evaporative Heating Surface (sq ft / m2)2526 / 234.76
Superheating Surface (sq ft / m2)500 / 46.47
Combined Heating Surface (sq ft / m2)3026 / 281.23
Evaporative Heating Surface/Cylinder Volume128.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,350
Same as above plus superheater percentage12,110
Same as above but substitute firebox area for grate area45,763
Power L16807
Power MT333.49

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