Kansas City Southern 2-8-8-0 "Consolidation Mallet" Type Locomotives

Class G-1 (Locobase 437)

G class were known simply as "Big Mallies." Calculated compound tractive effort was 122,683 lb. Purchase stimulated by success of 0-6-6-0s. Low-pressure, 41-in diameter pistons contained a volume of 24.44 cu ft each.

Assigned to KCS's Northern Division (KC to De Queen, Ark.). Two later refitted briefly to burn pulverized coal, but reverted to oil burning in 1930. Firebox heating surface included that provided by 92 sq ft in 4 arch tubes and 127 sq ft in a combustion chamber.

Class G-2 (Locobase 438)

Built at Brooks.

Calculated compound tractive effort was 110,400 lb or, using the ARA method, 103,700 lb. BDF, GDF calculated from ARA compound TE. Low-pressure, 41-in diameter pistons contained a volume of 24.44 cu ft each.

Class G-2S (Locobase 308)

7 Big Mallies were rebuilt as 4-cylinder simple articulateds by the KCS during World War II. Eliminating those massive, 41-inch diameter low-pressure cylinders permitted a speed increase of up to 50%. Firebox heating surface includes 102.5 sq ft of thermic syphons and 28 sq ft of arch tubes. Piston valves measured 12" in diameter. Fitted with a Worthington 6-A feedwater heater.

http://home.insightbb.com/~sammy56/folio/fo43-11.jpg (August 2002) has the blueprint elevation with all the data. Although the diagram clearly shows a combustion chamber, its length isn't recorded.

Specifications
Class	G-1	G-2	G-2S
Locobase ID	437	438	308
Railroad	Kansas City Southern (KCS)	Kansas City Southern (KCS)	Kansas City Southern (KCS)
Whyte	2-8-8-0	2-8-8-0	2-8-8-0
Road Numbers	750-756	757-766	752, 757-759,762,764,766
Gauge	Std	Std	Std
Builder	Alco-Schenectady	Alco-Brooks
Year	1918	1924	1943
Valve Gear	Baker	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	15.50'	15.50'	15.50'
Engine Wheelbase	50.50'	50.50'	50.50'
Ratio of driving wheelbase to overall engine wheebase	0.31	0.31	0.31
Overall Wheelbase (engine & tender)	84.70'	84.70'	84.70'
Axle Loading (Maximum Weight per Axle)	61700 lbs
Weight on Drivers	466000 lbs	474000 lbs	476400 lbs
Engine Weight	495000 lbs	503000 lbs	507300 lbs
Tender Light Weight	218900 lbs	206000 lbs	206000 lbs
Total Engine and Tender Weight	713900 lbs	709000 lbs	713300 lbs
Tender Water Capacity	1000 gals	10500 gals	10500 gals
Tender Fuel Capacity (oil/coal)	4266 gals	4000 gals	4266 gals
Minimum weight per yard of rail on which locomotive could run	97.08 lb rail	98.75 lb rail	99.25 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	57"	57"	57"
Boiler Pressure	210 psi	225 psi	250 psi
Cylinders (dia x stroke)	26" x 32"	26" x 32"	22.5" x 32" (4)
Low Pressure Cylinders (dia x stroke)	41" x 32"	41" x 32"	" x "
Tractive Effort	96627 lbs	103529 lbs	120789 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.82	4.58	3.94
	Heating Ability
Firebox Area	454 sq. ft	414 sq. ft	371.50 sq. ft
Grate Area	88.30 sq. ft	88.30 sq. ft	88.31 sq. ft
Evaporative Heating Surface	5231	5170	5304
Superheating Surface	1434	1459	1459
Combined Heating Surface	6665	6629	6763
Evaporative Heating Surface/Cylinder Volume	266.02	262.92	180.09
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	18543	19867.50	22077.50
Same as above plus superheater percentage	22532.60	24240.21	26840.34
Same as above but substitute firebox area for grate area	115852.76	113651.71	112911.17
Power L1	8325.84	8904.81	16363.57
Power MT	315.11	331.34	605.80