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 ID12,440 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 Wheelbase (ft)15.0915.09171717
Engine Wheelbase (ft)23.7523.4225.6725.6725.67
Ratio of driving wheelbase to overall engine wheebase 0.64 0.64 0.66 0.66 0.66
Overall Wheelbase (engine & tender) (ft)51.5251.5258.5058.5058.50
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)160,200160,200198,850198,850198,850
Engine Weight (lbs)178,400178,400222,650220,500220,500
Tender Loaded Weight (lbs)111,800111,800149,000149,000149,000
Total Engine and Tender Weight (lbs)290,200290,200371,650369,500369,500
Tender Water Capacity (gals)60006000800080008000
Tender Fuel Capacity (oil/coal) (gals/tons)1010151515
Minimum weight of rail (calculated) (lb/yd)6767838383
Geometry Relating to Tractive Effort
Driver Diameter (in)5555636363
Boiler Pressure (psi)200185200200200
High Pressure Cylinders (dia x stroke) (in)17" x 30"20.5" x 30"24" x 30"24" x 30"24.5" x 30"
Low Pressure Cylinders (dia x stroke) (in)28" x 30"
Tractive Effort (lbs)39,16136,04646,62946,62948,592
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09 4.44 4.26 4.26 4.09
Heating Ability
Firebox Area (sq ft)182206199184184
Grate Area (sq ft)31.5031.5049.5049.5049.50
Evaporative Heating Surface (sq ft)24342459371330033003
Superheating Surface (sq ft)619619
Combined Heating Surface (sq ft)24342459371336223622
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 percentage63005828990011,58311,583
Same as above but substitute firebox area for grate area36,40038,11039,80043,05643,056
Power L128675163629412,69312,180
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 Wheelbase (ft)1717
Engine Wheelbase (ft)25.6725.67
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66
Overall Wheelbase (engine & tender) (ft)58.5059.54
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)199,850218,300
Engine Weight (lbs)230,500240,500
Tender Loaded Weight (lbs)149,000150,000
Total Engine and Tender Weight (lbs)379,500390,500
Tender Water Capacity (gals)80008000
Tender Fuel Capacity (oil/coal) (gals/tons)1514
Minimum weight of rail (calculated) (lb/yd)8391
Geometry Relating to Tractive Effort
Driver Diameter (in)6363
Boiler Pressure (psi)180200
High Pressure Cylinders (dia x stroke) (in)26" x 30"26" x 30"
Tractive Effort (lbs)49,25154,724
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06 3.99
Heating Ability
Firebox Area (sq ft)238286
Grate Area (sq ft)49.5070
Evaporative Heating Surface (sq ft)30993083
Superheating Surface (sq ft)619619
Combined Heating Surface (sq ft)37183702
Evaporative Heating Surface/Cylinder Volume168.10167.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation891014,000
Same as above plus superheater percentage10,42516,380
Same as above but substitute firebox area for grate area50,12366,924
Power L110,10911,487
Power MT446.06464.03

Reference