Taiwan Railway 2-6-2 Locomotives in Formosa


Class Details by Steve Llanso of Sweat House Media

Class CK100 (Locobase 3863)

[] by Ejii Nozawa data. Nozawa says that these were improved CK50s, from which they differed in having higher boiler pressure, higher adhesive weight, and a smaller boiler and firebox.


Class CK120 (Locobase 3864)

These were virtual duplicates of the JNR's C12 class and were operated on the island of Taiwan, then called Formosa and governed by the Japanese.

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000.

Information from Ejii Nozawa's web site ([]) about the number and dates built.


Class CK50 (Locobase 3861)

[] by Ejii Nozawa data. After a trial run of two locomotives, which had very slightly different dimensions, Kisha Seiko delivered twelve more engines of this class between 1905 and 1912. These long-boilered tans were used on mountain sections, according to Nozawa.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassCK100CK120CK50
Locobase ID3863 3864 3861
RailroadTaiwan RailwayTaiwan RailwayTaiwan Railway
CountryFormosaFormosaFormosa
Whyte2-6-2T2-6-2T2-6-2T
Number in Class14714
Road Numbers
GaugeStd3'6"Std
Number Built14714
BuilderKSKNipponKSK
Year191619361905
Valve GearWalschaertWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)37.42 / 11.4136.17 / 11.02
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)23,523 / 10,670
Weight on Drivers (lbs / kg)91,177 / 41,35770,548 / 32,00078,432 / 35,576
Engine Weight (lbs / kg)108,023 / 48,998110,341 / 50,050108,640 / 49,278
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)108,023 / 48,998110,341 / 50,050108,640 / 49,278
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.5039 / 19.5044 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)49 / 124555 / 139749 / 1245
Boiler Pressure (psi / kPa)185 / 12.80200 / 13.80160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 22" / 406x55915.7" x 24" / 400x61016" x 22" / 406x559
Tractive Effort (lbs / kg)18,074 / 8198.2418,285 / 8293.9515,632 / 7090.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.04 3.86 5.02
Heating Ability
Tubes (number - dia) (in / mm)68 - 1.57" / 40
Flues (number - dia) (in / mm)16 - 4.69" / 119
Flue/Tube length (ft / m)10.50 / 3.20
Firebox Area (sq ft / m2)89.31 / 8.30
Grate Area (sq ft / m2)13.02 / 1.2114 / 1.3015.06 / 1.40
Evaporative Heating Surface (sq ft / m2)908 / 84.39585 / 54.371025 / 95.26
Superheating Surface (sq ft / m2)213 / 19.80
Combined Heating Surface (sq ft / m2)908 / 84.39798 / 74.171025 / 95.26
Evaporative Heating Surface/Cylinder Volume177.36108.79200.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation240928002410
Same as above plus superheater percentage240935562410
Same as above but substitute firebox area for grate area22,685
Power L110,052
Power MT942.37

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