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


Class Details by Steve Llanso of Sweat House Media

Class H (Locobase 915)

Data from home.insightbb.com/~sammy56/folio/fo43-12.jpg (August 2002). Works numbers were 50621-50628 in March 1912.

Piston valves were a relatively generous 14" (356 mm) in diameter. Firebox heating surface included 37.5 sq ft (3.48 sq m) of arch tubes.

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.

The 800 and 806 were sold to the Louisiana & Arkansas in February 1939. The others served through World War Two and were scrapped in the 1950s.


Class H-1 (Locobase 916)

Data from home.insightbb.com/~sammy56/folio/fo43-13.jpg (August 2002). Works numbers were 61518-61520 in October 1919.

H-1s were essentially repeats of the H class (Locobase 915), but were slightly heavier. They also used 14" (356 mm) piston valves for steam admission. 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 (6.27 sq m) of thermic syphons for the arch tubes, while retaining 9.5 sq ft (0.84 sq m) of arch tube surface; this represented a total of 77 sq ft (7.15 sq m) of firebox heating surface.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassHH-1
Locobase ID915 916
RailroadKansas City Southern (KCS)Kansas City Southern (KCS)
CountryUSAUSA
Whyte4-6-24-6-2
Number in Class83
Road Numbers800-807808-810
GaugeStdStd
Number Built83
BuilderAlco-SchenectadyAlco-Schenectady
Year19121919
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.1113.50 / 4.11
Engine Wheelbase (ft / m)34.59 / 10.5434.59 / 10.54
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39
Overall Wheelbase (engine & tender) (ft / m)77.35 / 23.5877.64 / 23.66
Axle Loading (Maximum Weight per Axle) (lbs / kg)58,100 / 26,354
Weight on Drivers (lbs / kg)159,500 / 72,348166,500 / 75,523
Engine Weight (lbs / kg)258,000 / 117,027268,000 / 121,563
Tender Loaded Weight (lbs / kg)180,000 / 81,647183,600 / 83,280
Total Engine and Tender Weight (lbs / kg)438,000 / 198,674451,600 / 204,843
Tender Water Capacity (gals / ML)8220 / 31.149000 / 34.09
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)3000 / 11.403000 / 11.40
Minimum weight of rail (calculated) (lb/yd / kg/m)89 / 44.5093 / 46.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)75 / 190575 / 1905
Boiler Pressure (psi / kPa)200 / 13.80225 / 15.50
High Pressure Cylinders (dia x stroke) (in / mm)24" x 28" / 610x71124" x 28" / 610x711
Tractive Effort (lbs / kg)36,557 / 16582.0041,126 / 18654.46
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.36 4.05
Heating Ability
Firebox Area (sq ft / m2)245 / 22.77284 / 26.39
Grate Area (sq ft / m2)62.51 / 5.8162.51 / 5.81
Evaporative Heating Surface (sq ft / m2)3191 / 296.563231 / 300.28
Superheating Surface (sq ft / m2)749 / 69.61749 / 69.61
Combined Heating Surface (sq ft / m2)3940 / 366.173980 / 369.89
Evaporative Heating Surface/Cylinder Volume217.66220.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,50214,065
Same as above plus superheater percentage14,87716,737
Same as above but substitute firebox area for grate area58,31076,041
Power L119,02521,854
Power MT788.89868.10

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