Kansas City Southern 4-6-2 "Pacific" Type Locomotives

Class H (Locobase 915)

Firebox heating surface included 37.5 sq ft of arch tubes. Data from home.insightbb.com/~sammy56/folio/fo43-12.jpg (August 2002). Piston valves were a relatively generous 14" in diameter.

Some of these engines had tuned air horns that emitted a crow's caw, which heralded the approach of the passenger varnish known as the Flying Crow. On this service, they sported gold trim, lettering, and an emblem on the tender.

Modifications included mounting another sand dome on the boiler, moving the bell ahead of the stack, and changing the center driving pair to disc-type wheels.

Class H-1 (Locobase 916)

H-1s were essentially repeats of the H class, but were slightly heavier. Hs and H-1s were later rebuilt to stand the higher, 225-lb boiler pressure and achieve the tractive effort shown in this entry. At that point the railroad added 67.5 sq ft of thermic syphons for the arch tubes, while retaining 9.5 sq ft of arch tube surface; this represented a total of 77 sq ft of firebox heating surface.

Data from home.insightbb.com/~sammy56/folio/fo43-13.jpg (August 2002).

Specifications
Class	H	H-1
Locobase ID	915	916
Railroad	Kansas City Southern (KCS)	Kansas City Southern (KCS)
Whyte	4-6-2	4-6-2
Road Numbers	800-807	808-810
Gauge	Std	Std
Builder	Alco-Schenectady	Alco-Schenectady
Year	1912	1919
Valve Gear	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	13.50'	13.50'
Engine Wheelbase	34.59'	34.59'
Ratio of driving wheelbase to overall engine wheebase	0.39	0.39
Overall Wheelbase (engine & tender)	77.35'	77.64'
Axle Loading (Maximum Weight per Axle)		58100 lbs
Weight on Drivers	159500 lbs	166500 lbs
Engine Weight	258000 lbs	268000 lbs
Tender Light Weight	180000 lbs	183600 lbs
Total Engine and Tender Weight	438000 lbs	451600 lbs
Tender Water Capacity	8220 gals	9000 gals
Tender Fuel Capacity (oil/coal)	3000 gals	3000 gals
Minimum weight per yard of rail on which locomotive could run	88.61 lb rail	92.50 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	75"	75"
Boiler Pressure	200 psi	225 psi
Cylinders (dia x stroke)	24" x 28"	24" x 28"
Tractive Effort	36557 lbs	41126 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.36	4.05
	Heating Ability
Firebox Area	245 sq. ft	284 sq. ft
Grate Area	62.51 sq. ft	62.51 sq. ft
Evaporative Heating Surface	3191	3231
Superheating Surface	749	749
Combined Heating Surface	3940	3980
Evaporative Heating Surface/Cylinder Volume	217.66	220.38
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	12502	14064.75
Same as above plus superheater percentage	14878.65	16711.61
Same as above but substitute firebox area for grate area	58314.97	75925.40
Power L1	19025.27	21854.25
Power MT	788.91	868.11