Chosen Government 2-6-2 Locomotives in Korea

Class Details by Steve Llanso of Sweat House Media

Class Puresa (Locobase 21046)

Data from "Sentetsu Puresa-class locomotives" in Wikipedia at [], last accessed 10 July 2022. Works numbers were 8206-8219 in December 1911.

Wikipedia explains that Japanese railways, including those operated in conquered and annexed Korea, called engines of this wheel arrangement "Pure", an approximation of the American term "Prairie". Ordered by Okura & Company, the locomotives arrived in "kit" form and were assembled at the CGR's Busan shops.

Compared to other Prairie tanks in Japan, Formosa, and Korea, these were among the largest.

After Japan's defeat in 1945, all of the locomotives were split between South Korea (Pureo3) and North Korea (Puroso). Wikipedia notes that which locomotives went to whom cannot be determined.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID21046
RailroadChosen Government (Sentetsu)
Number in Class14
Road Numbers80-93/281-294/
Number Built14
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)81,571 / 37,000
Engine Weight (lbs / kg)114,640 / 52,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)114,640 / 52,000
Tender Water Capacity (gals / ML)1558 / 5.90
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.40 / 1.25
Minimum weight of rail (calculated) (lb/yd / kg/m)45 / 22.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)53.90 / 1370
Boiler Pressure (psi / kPa)159.50 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16.14" x 24.02" / 410x610
Tractive Effort (lbs / kg)15,739 / 7139.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.18
Heating Ability
Tubes (number - dia) (in / mm)177 - 2.008" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.33 / 3.15
Firebox Area (sq ft / m2)102.26 / 9.50
Grate Area (sq ft / m2)18.19 / 1.69
Evaporative Heating Surface (sq ft / m2)1067 / 99.10
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1067 / 99.10
Evaporative Heating Surface/Cylinder Volume187.59
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2901
Same as above plus superheater percentage2901
Same as above but substitute firebox area for grate area16,310
Power L13976
Power MT322.38

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