Wabash 2-6-2 "Prairie" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class G1 - 64"" (Locobase 6933)

Railroad Age Gazette (17 July 1908) reported that these locomotives were fast freight Prairies virtually identical to those in service on the CB&Q. Unlike the first 60 (Locobase 6932), these had 64" drivers, which meant they weren't intended for some of the higher-end freight traffic served by the 70" engines. Like those locomotives, this batch was superheated later on.

See also data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.


Class G1 - 70"" (Locobase 4202)

Railroad Age Gazette (17 July 1908) reported that these locomotives were fast freight Prairies virtually identical to those in service on the CB&Q; the latter had 69" drivers. (Drury - 1993 - says the whole class had 64" drivers, but the first 60, which included the batch described by RAG, had 70" wheels.) Earlier engines in the class had gone into service in 1907.

They were reported to have a train load capacity of 1,750-2,100 tons on lines with grades between 0.5-0.85%. RAG noted several features about the design, in particular the trend toward the use of flexible staybolts in great numbers and the provision of leading truck wheels 37 1/2" in diameter.

Of the 90 G-1s, 23 became J-2 Pacifics beginning in 1916. Retirements of the Prairies began in 1934 and ended in 1950.

See also data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.


Class G1s - 64"" (Locobase 6934)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This batch was identical to the earlier G-1s, but had smaller drivers. Like the others, these were superheated beginning in the teens, 3 having been ministered to by January 1917. By the end of the 1920s, all had been superheated. The result is a nicely balanced design in Locobase's opinion. The heat generator wasn't overworked and if the max axle loading was a bit high -- well, these were mainline engines.


Class G1s - 70"" (Locobase 6932)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The Wabash's lone Prairie ...(Locobase is unapologetic). Not long after the G-1s went into service, railroads became convinced of the value of superheating. In the Wabash's case, they leaped at the chance to apply it to their 2-6-2s. By January 1917 three had already been made over. By the late 1920s 37 of the original 60 had been redone.

The last batch of 30 supplied by Alco in 1907, which had 64" drivers, were also superheated; see Locobase 6933.

Specifications by Steve Llanso of Sweat House Media
ClassG1 - 64""G1 - 70""G1s - 64""G1s - 70""
Locobase ID6933 4202 6934 6932
RailroadWabashWabashWabashWabash
CountryUSAUSAUSAUSA
Whyte2-6-22-6-22-6-22-6-2
Number in Class30603737
Road Numbers2061-20902001-206020012001
GaugeStdStdStdStd
Number Built3060
BuilderAlco-RogersseveralWabashWabash
Year1907190619171917
Valve GearWalschaertWalschaertStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase13.37'13.37'13.37'13.37'
Engine Wheelbase30.71'30.71'30.71'30.71'
Ratio of driving wheelbase to overall engine wheebase 0.44 0.44 0.44 0.44
Overall Wheelbase (engine & tender)63.35'63.35'61.35'61.35'
Axle Loading (Maximum Weight per Axle)62650 lbs62650 lbs
Weight on Drivers143100 lbs143100 lbs167900 lbs167900 lbs
Engine Weight203100 lbs203100 lbs230100 lbs230100 lbs
Tender Light Weight155317 lbs155317 lbs153000 lbs153000 lbs
Total Engine and Tender Weight358417 lbs358417 lbs383100 lbs383100 lbs
Tender Water Capacity7700 gals7700 gals6000 gals6000 gals
Tender Fuel Capacity (oil/coal)15 tons15 tons10 tons10 tons
Minimum weight of rail (calculated)80 lb/yard80 lb/yard93 lb/yard93 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter64"70"64"70"
Boiler Pressure200 psi200 psi210 psi210 psi
Cylinders (dia x stroke)22" x 28"22" x 28"23" x 28"23" x 28"
Tractive Effort35998 lbs32912 lbs41312 lbs37771 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.98 4.35 4.06 4.45
Heating Ability
Firebox Area190.50 sq. ft190.50 sq. ft218 sq. ft218 sq. ft
Grate Area54.25 sq. ft54.25 sq. ft54.25 sq. ft54.25 sq. ft
Evaporative Heating Surface3559 sq. ft3559 sq. ft2805 sq. ft2805 sq. ft
Superheating Surface613 sq. ft613 sq. ft
Combined Heating Surface3559 sq. ft3559 sq. ft3418 sq. ft3418 sq. ft
Evaporative Heating Surface/Cylinder Volume288.90288.90208.33208.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10850108501139311393
Same as above plus superheater percentage10850108501344313443
Same as above but substitute firebox area for grate area38100381005402054020
Power L1781385451565817126
Power MT361.10394.94616.79674.62

Reference


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