Kansas City Southern 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

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 by Steve Llanso of Sweat House Media
Locobase ID915 916
RailroadKansas City Southern (KCS)Kansas City Southern (KCS)
Number in Class83
Road Numbers800-807808-810
Number Built83
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase13.50'13.50'
Engine Wheelbase34.59'34.59'
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 Drivers159500 lbs166500 lbs
Engine Weight258000 lbs268000 lbs
Tender Light Weight180000 lbs183600 lbs
Total Engine and Tender Weight438000 lbs451600 lbs
Tender Water Capacity8220 gals9000 gals
Tender Fuel Capacity (oil/coal)3000 gals3000 gals
Minimum weight of rail (calculated)89 lb/yard93 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter75"75"
Boiler Pressure200 psi225 psi
Cylinders (dia x stroke)24" x 28"24" x 28"
Tractive Effort36557 lbs41126 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.36 4.05
Heating Ability
Firebox Area245 sq. ft284 sq. ft
Grate Area62.51 sq. ft62.51 sq. ft
Evaporative Heating Surface3191 sq. ft3231 sq. ft
Superheating Surface749 sq. ft749 sq. ft
Combined Heating Surface3940 sq. ft3980 sq. ft
Evaporative Heating Surface/Cylinder Volume217.66220.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1250214065
Same as above plus superheater percentage1487716737
Same as above but substitute firebox area for grate area5831076041
Power L11902521854
Power MT788.89868.10


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