Chicago Great Western 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class G1 (Locobase 12440)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 23, p 98. Works numbers were 18375-18376, 18386, 18406-18408 in November 1900 and 18443-18444, 18479-18480 in December.

The specs for this decade of Vauclain compound Consolidations had cautions and guarantees written in the margins. The caution was a quotation from a previous letter "...to complain of prev[ious] eng[ines] leaking in mud ring corners and breakage of stay bolts." The latter featured as a frequent topic of general discussion among master mechanics. A separate, typewritten letter from a Mr. Van Alstinis of the CGW painstakingly describes the "numbers and marks to be stenciled on the wheels, tires and axles of the engines which you are now building for us."

Guarantees included "W[eigh]t on any pair of drivers not to exceed 42,000 lbs" and the ability "...to haul 1300 tons exclusive of eng[ine] and ten[der] up a 1% grade 5 miles long at a min[imum] speed of 10 miles per hour." Each piston valve, which served both the HP and LP cylinders on a side, measured 12" in diameter.

They were soon (1903-1907) converted to simple expansion; see Locobase 4184.


Class G1-simpled (Locobase 4184)

Data from CGW 1904 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Raildata collection. Works numbers were 18375-18376, 18386, 18406-18408 in November 1900 and 18443-18444, 18479-18480 in December.

According to the diagram, firebox heating surface included 24 sq ft of arch tubes. These entered CGW service as Vauclain compounds with two 17" HP and two 28" LP cylinders (Locobase 12440), but were soon (1903-1907) converted to simple expansion.

(The haste to abandon Vauclain's compounding system is all the more remarkable in light of the railroad's retention of Vauclain superheaters in its 2-6-2s, several of which were fitted with the low-temperature systems in the mid-'teens.)

CGW sold the 205 and 307 to locomotive reconditioner Birmingham Rail and Locomotive in December 1916. BR&L found a buyer for ex-205 in Eagle Pass Lumber of Eagle Pass, Texas in October 1920 and ex-307 to Petroleo Mexicano in June 1921.

304 and 306 were sold to the Illinois Southern in December 1910 and February 1911, respectively; the IS RR in turn sold them to the Missouri Illinois as 401-402 in December 1919. (The M-I ran trains on both banks of the Mississippi south of Saint Louis and included the older Mississippi River & Bonne Terre. It was absorbed by the Missouri Pacific in 1929.)

306 was converted to an 0-8-0 switcher, but the M-I sold the 304 back to the IS and the IS sold it to the Chicago, Indianapolis & Western as their 322 -- which is how it wound up on the Baltimore & Ohio in 1927 as E-43 class #436. The B & O scrapped 436 in December 1928.

303 and 308 were rebuilt as class J-1 0-8-0 switchers in 1909 & 1917 and scrapped in 1932 and April 1930, respectively.


Class G3 (Locobase 3090)

Data from "...Consolidation Locomotive - Chicago Great Western Railway", The Railroad Gazette, Volume 84, No 2 (February 1910), p 65. Railway Age 30 October 1914 (Vol 57, No. 18). See also DeGolyer, Volume 34, p. 115 and Volume 35, p. 174. Works numbers were 33892-33895, 33924-33925, 33934-33935, 33938-33939, 33945, 33949-33957 in October 1909; 35120-35123, 35156-35158 in August 1910; 35200-35210, 35289-35290 in September.

Firebox heating surface included 28 sq ft (2.6 sq m) of "water tubes." According to the diagram, firebox heating surface included 13 sq ft (1.2 sq m) of arch tubes, considerably less than the surface shown in RA.

Sizable Consolidations with relatively tall drivers whose boilers followed Harriman Lines practice. Twelve were rebuilt in 1927-1930 with 26" cylinders, which raised their tractive effort to 54,700 lb, and larger fireboxes. They were then designated G-4; see Locobase 6123. The first retirement came in 1930, the last in 1950.

See G3s (Locobases 4182-4184) for superheated conversions.


Class G3s/24 (Locobase 4183)

See Railway Age 30 October 1914 (Volume 57, No. 18). Also see http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. According to the diagram, firebox heating surface included 13 sq ft of arch tubes.

Drury's (1993) comment that the G4s came from increasing cylinder size in G3s to 26" in the late 1920s appears to refer to 12 of these superheated G3s.


Class G3s/24.5 (Locobase 4181)

See Railway Age 30 October 1914 (Vol 57, No. 18). Also see http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. According to the diagram, firebox heating surface included 13 sq ft of arch tubes.

Drury's (1993) comment that the G4s came from increasing cylinder size in G3s to 26" in the late 1920s appears to refer to twelve of these superheated G3s that had originally been upgraded to 24 1/2" cylinders. When the shops installed the larger cylinders, they also fitted 15" (381 mm) piston valves.

Some of these were later fitted with 54 sq ft (5 sq m) of thermic syphons as well.


Class G3s/26 (Locobase 4182)

Data from CGW 9 -- 1948 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Raildata collection.

These conversions from the basic G3, which was delivered in 1910 (see Locobase 3090), increased cylinder size by 2" and added superheat.. See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. According to the diagram, firebox heating surface included 13 sq ft (1.21. sq m) of arch tubes.

A Railway Age article of 30 October 1914 describes the superheated G3, but not the later version with syphons shown in the 1943 diagram book supplied by Allen Stanley.

This variant, reflected in the data, was created in the 1920s. After the retrofit, the firebox heating surface included both 13 sq ft of arch tubes and 54 sq ft of thermic syphons.


Class G4 (Locobase 6123)

Data from 1943 CGW diagram book supplied by Allen Stanley from his extensive Raildata collection in March 2004.

This was a subclass of former G3 locomotives that were superheated in the late 'teens and all were fitted with thermic syphons in the late 1920s. As a result, firebox heating surface now included 13 sq ft (1.21 sq m) of arch tubes and 65 sq ft (6.04 sq m) of syphons.

Specifications by Steve Llanso of Sweat House Media
ClassG1G1-simpledG3G3s/24G3s/24.5
Locobase ID12440 4184 3090 4183 4181
RailroadChicago Great Western (CGW)Chicago Great Western (CGW)Chicago Great Western (CGW)Chicago Great Western (CGW)Chicago Great Western (CGW)
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class101040146
Road Numbers300-309300-309320-359
GaugeStdStdStdStdStd
Number Built10406
BuilderBurnham, Williams & CoCGWBaldwinCGWCGW
Year19001904191019151915
Valve GearStephensonStephensonWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase15.09'15.09'17'17'17'
Engine Wheelbase23.75'23.42'25.67'25.67'25.67'
Ratio of driving wheelbase to overall engine wheebase 0.64 0.64 0.66 0.66 0.66
Overall Wheelbase (engine & tender)51.52'51.52'58.50'58.50'58.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers160200 lbs160200 lbs198850 lbs198850 lbs198850 lbs
Engine Weight178400 lbs178400 lbs222650 lbs220500 lbs220500 lbs
Tender Light Weight111800 lbs111800 lbs149000 lbs149000 lbs149000 lbs
Total Engine and Tender Weight290200 lbs290200 lbs371650 lbs369500 lbs369500 lbs
Tender Water Capacity6000 gals6000 gals8000 gals8000 gals8000 gals
Tender Fuel Capacity (oil/coal)10 tons10 tons15 tons15 tons15 tons
Minimum weight of rail (calculated)67 lb/yard67 lb/yard83 lb/yard83 lb/yard83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter55"55"63"63"63"
Boiler Pressure200 psi185 psi200 psi200 psi200 psi
High Pressure Cylinders (dia x stroke)17" x 30"20.5" x 30"24" x 30"24" x 30"24.5" x 30"
Low Pressure Cylinders (dia x stroke)28" x 30" (2)
Tractive Effort39161 lbs36046 lbs46629 lbs46629 lbs48592 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09 4.44 4.26 4.26 4.09
Heating Ability
Firebox Area182 sq. ft206 sq. ft199 sq. ft184 sq. ft184 sq. ft
Grate Area31.50 sq. ft31.50 sq. ft49.50 sq. ft49.50 sq. ft49.50 sq. ft
Evaporative Heating Surface2434 sq. ft2459 sq. ft3713 sq. ft3003 sq. ft3003 sq. ft
Superheating Surface619 sq. ft619 sq. ft
Combined Heating Surface2434 sq. ft2459 sq. ft3713 sq. ft3622 sq. ft3622 sq. ft
Evaporative Heating Surface/Cylinder Volume308.83214.56236.38191.18183.45
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation63005828990099009900
Same as above plus superheater percentage6300582899001158311583
Same as above but substitute firebox area for grate area3640038110398004305643056
Power L12867516362941269312180
Power MT157.82284.21279.12562.90540.15

Specifications by Steve Llanso of Sweat House Media
ClassG3s/26G4
Locobase ID4182 6123
RailroadChicago Great Western (CGW)Chicago Great Western (CGW)
CountryUSAUSA
Whyte2-8-02-8-0
Number in Class712
Road Numbers320-321, 347, 349, 351-353600-611
GaugeStdStd
Number Built
BuilderCGWCGW
Year19151927
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase17'17'
Engine Wheelbase25.67'25.67'
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66
Overall Wheelbase (engine & tender)58.50'59.54'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers199850 lbs218300 lbs
Engine Weight230500 lbs240500 lbs
Tender Light Weight149000 lbs150000 lbs
Total Engine and Tender Weight379500 lbs390500 lbs
Tender Water Capacity8000 gals8000 gals
Tender Fuel Capacity (oil/coal)15 tons14 tons
Minimum weight of rail (calculated)83 lb/yard91 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"
Boiler Pressure180 psi200 psi
Cylinders (dia x stroke)26" x 30"26" x 30"
Tractive Effort49251 lbs54724 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06 3.99
Heating Ability
Firebox Area238 sq. ft286 sq. ft
Grate Area49.50 sq. ft70 sq. ft
Evaporative Heating Surface3099 sq. ft3083 sq. ft
Superheating Surface619 sq. ft619 sq. ft
Combined Heating Surface3718 sq. ft3702 sq. ft
Evaporative Heating Surface/Cylinder Volume168.10167.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation891014000
Same as above plus superheater percentage1042516380
Same as above but substitute firebox area for grate area5012366924
Power L11010911487
Power MT446.06464.03

Reference


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