South Manchuria - Chosen 4-6-2 Locomotives in Korea


Class Details by Steve Llanso of Sweat House Media

Class 901 (Locobase 13138)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 60, p. 127. Works numbers were 54135 in November 1920, 54198-54208 in December.

Following the SM main-line Pacifics of the 900 class into service, these were based on the Chosen lines and had more cylinder volume, a lower boiler pressure, a larger grate, but smaller firebox with 18.3 sq ft of arch tubes. The Chosen engines also had a longer engine wheelbase, but a smaller tender.

Principal Dimensions by Steve Llanso of Sweat House Media

Class901
Locobase ID13138
RailroadSouth Manchuria - Chosen
CountryKorea
Whyte4-6-2
Number in Class12
Road Numbers901-912
GaugeStd
Number Built12
BuilderBaldwin
Year1920
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)32.33 / 9.85
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)63.60 / 19.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)126,000 / 57,153
Engine Weight (lbs / kg)207,000 / 93,894
Tender Loaded Weight (lbs / kg)110,000 / 54,431
Total Engine and Tender Weight (lbs / kg)317,000 / 148,325
Tender Water Capacity (gals / ML)5500 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 11
Minimum weight of rail (calculated) (lb/yd / kg/m)70 / 35
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 1753
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)24" x 26" / 610x660
Tractive Effort (lbs / kg)33,208 / 15062.91
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Tubes (number - dia) (in / mm)168 - 2" / 51
Flues (number - dia) (in / mm)26 - 5.375" / 137
Flue/Tube length (ft / m)18.17 / 5.54
Firebox Area (sq ft / m2)171.30 / 15.92
Grate Area (sq ft / m2)47 / 4.37
Evaporative Heating Surface (sq ft / m2)2423 / 225.19
Superheating Surface (sq ft / m2)590 / 54.83
Combined Heating Surface (sq ft / m2)3013 / 280.02
Evaporative Heating Surface/Cylinder Volume177.98
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8460
Same as above plus superheater percentage10,152
Same as above but substitute firebox area for grate area37,001
Power L113,061
Power MT685.58

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