Eastern Railway of Minnesota / Great Northern / Montana Central / Saint Paul, Minneapolis & Manitoba(GN 4-8-0 "Mastodon" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class G-1 (Locobase 8565)

Data from M Grille & MH Falconnette, Les Chemins de Fer a L'Exposition de Chicago, (Paris, France: E Bernard et Cie, 1894), p 44-47, supplemented by GN 1916 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Brooks 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 numbers werew 1972-1981in October 1891, 1998-2000 in November, 2001-2002 in December and a exhibition engine for the Columbian Exposition in Chicago as works number 2261 in March 1893.

This class was originally delivered with 20" x 24" cylinders. Even with the longer stroke, the cylinder proportions were still at odds with most Twelve-wheelers. Like virtually all Great Northern locomotives, however, these had Belpaire fireboxes.

The StPM&M was organized in May 1879 as an amalgamation of the Saint Paul & Pacific, Morehead & Barnesville, and the Red River Valley. At that point, the Great Northern leased the railroad (extending it in 1890), but the StPM&M held on to its separate identity until the line was sold to the GN in 1907.

When these fifteen Twelve-wheelers arrived, the StPM&M comprised 2,775 miles. At the time of its sale, the railroad encompassed 3,879 miles of track.


Class G-2 (Locobase 8847)

Data from GN 1916 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Brooks produced these in June (2973-2975), July (2982-2990), August (3045-3048), and September (3049-3052).

Like all GN 4-8-0s, the G-2s had small drivers and Belpaire fireboxes. Very shortly after the ERofM had taken delivery of this class, the railroad was absorbed by the Great Northern. Except for the 701, which was converted to a 2-8-0 and redesignated F-3, these Twelve-wheelers remained essentially unchanged and had 30-year careers.


Class G-3 (Locobase 8816)

Data from GN 4 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This large order of Twelve-wheelers came at the height of that wheel arrangement's popularity. As with most GN locomotives, this design had the signature Belpaire firebox. The small drivers meant these would always perform in slow-freight duties, but they were serviceable enough for 20 to have been retained through World War II. Some of the class had bigger tenders carrying 15 tons of coal.

At least one was superheated; see Locobase 8817.


Class G-3-S (Locobase 8817)

Data from GN 4 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Among the 50-odd G-3 Twelve-wheelers were a couple that were later superheated. The H & D superheater is a rarity - notice the small bore of the flues. The gain in effective steam was needed for the railroad increased the cylinder diameter by 4 1/2", while reducing boiler pressure to an anemic 160 psi. 722 had 189 2" tubes as shown while 734 had 185 and a total evaporative heating surface of 1,980 sq ft.


Class G-4 (Locobase 8818)

Data from GN 4 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The large Rogers order for 50 Twelve-wheelers in 1899-1900 (see Locobase 8816) was followed by this decade from the Dunkirk, New York builder who had made a specialty out of large engines in this wheel arrangement. The boiler certainly was large and must have taxed the relatively small grate in the Belpaire firebox.


Class G-5 (Locobase 191)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). See also "Heavy Twelve-wheel Locomotives for the Great Northern", Railroad Gazette, Volume XXX, No 1 (7 Jan 1898), pp. 3-5; "106-Ton Twelve Wheel Locomotive; Great Northern Railway," Engineering News, Volume XXXIX, No. 15 (14 April 1898), pp. 236-237; Charles McShane (1899). Works numbers were 2866-28677 in December 1897 and 2999-3004 in July 1898.

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

Designed by JO Pattee, superintendent of Motive Power for the Great Northern for its subsidiary MC.. Not a very attractive engine because of its high Improved Belpaire (aka Player-Belpaire) boiler with its inelegant square-shouldered firebox. (The firebox contained 26 sq ft/2.4 sq m of arch pipes.) Still, the 16-in (406 mm) diameter piston valves are worthy of notice, as large, McShane noted, as the pistons of many locomotives then in service. Indeed, much about the engine, including a 34-in piston stroke and other "brobdignagian" dimensions, made it a conversation piece of the time.

MC #103 was Brooks's 3,000th engine. When the Great Northern absorbed the Montana Central in 1902, this class was renumbered 800-807. One -- 806 -- was turned into a 2-8-0 in 1905 and redesignated F-10. All were scrapped in the late 1920s - early 1930s.

Two later classes -- G-3 (50 from Rogers) and G-4 (10 from Brooks for the Eastern Railway of Minnesota) were similar, but had 19 x 32" cylinders.

Specifications by Steve Llanso of Sweat House Media
ClassG-1G-2G-3G-3-SG-4
Locobase ID8565 8847 8816 8817 8818
RailroadSaint Paul, Minneapolis & Manitoba(GN)Eastern Railway of Minnesota (GN)Great Northern (GN)Great Northern (GN)Great Northern (GN)
CountryUSAUSAUSAUSAUSA
Whyte4-8-04-8-04-8-04-8-04-8-0
Number in Class162050110
Road Numbers400-415700-719720-769722770-779
GaugeStdStdStdStdStd
Number Built16205010
BuilderBrooksBrooksRogersGNBrooks
Year1891189818991900
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.5015.3315.5815.5815.33
Engine Wheelbase (ft)25.2526.1723.0823.0822.83
Ratio of driving wheelbase to overall engine wheebase 0.61 0.59 0.68 0.68 0.67
Overall Wheelbase (engine & tender) (ft)52.0853.8352.6054.0853.83
Axle Loading (Maximum Weight per Axle) (lbs)35,50037,00037,00037,500
Weight on Drivers (lbs)136,025142,000148,000148,000150,000
Engine Weight (lbs)155,975176,000182,000182,000182,000
Tender Loaded Weight (lbs)82,01290,000102,000126,800107,000
Total Engine and Tender Weight (lbs)237,987266,000284,000308,800289,000
Tender Water Capacity (gals)47525000500060005000
Tender Fuel Capacity (oil/coal) (gals/tons) 8.808840008
Minimum weight of rail (calculated) (lb/yd)5759626263
Geometry Relating to Tractive Effort
Driver Diameter (in)5555555555
Boiler Pressure (psi)180200180160180
High Pressure Cylinders (dia x stroke) (in)20" x 26"19" x 32"19" x 32"23.5" x 32"19" x 32"
Tractive Effort (lbs)28,93135,70632,13643,69832,136
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.70 3.98 4.61 3.39 4.67
Heating Ability
Firebox Area (sq ft)192219.50198198228
Grate Area (sq ft)31.6335.2034.1834.1835.20
Evaporative Heating Surface (sq ft)22262863249320243080
Superheating Surface (sq ft)375
Combined Heating Surface (sq ft)22262863249323993080
Evaporative Heating Surface/Cylinder Volume235.46272.64237.40125.99293.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation56937040615254696336
Same as above plus superheater percentage56937040615263446336
Same as above but substitute firebox area for grate area34,56043,90035,64036,74941,040
Power L155616914547358336631
Power MT360.52429.37326.11347.56389.84

Specifications by Steve Llanso of Sweat House Media
ClassG-5
Locobase ID191
RailroadMontana Central (GN)
CountryUSA
Whyte4-8-0
Number in Class8
Road Numbers100-107/800-807
GaugeStd
Number Built8
BuilderBrooks
Year1897
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.83
Engine Wheelbase (ft)26.67
Ratio of driving wheelbase to overall engine wheebase 0.59
Overall Wheelbase (engine & tender) (ft)54.25
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)172,000
Engine Weight (lbs)212,750
Tender Loaded Weight (lbs)96,000
Total Engine and Tender Weight (lbs)308,750
Tender Water Capacity (gals)4500
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)72
Geometry Relating to Tractive Effort
Driver Diameter (in)55
Boiler Pressure (psi)210
High Pressure Cylinders (dia x stroke) (in)21" x 34"
Tractive Effort (lbs)48,662
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.53
Heating Ability
Firebox Area (sq ft)235
Grate Area (sq ft)34
Evaporative Heating Surface (sq ft)3280
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)3280
Evaporative Heating Surface/Cylinder Volume240.65
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7140
Same as above plus superheater percentage7140
Same as above but substitute firebox area for grate area49,350
Power L16292
Power MT322.59

Reference


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