Japanese Government Railways 2-6-4 Locomotives in Japan


Class Details by Steve Llanso of Sweat House Media

Class C10 (Locobase 3824)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 27 September 2015.

Firebox heating surface includes 11.8 sq ft (1.1 sq m) of arch tubes. These weren't the definitive Baltic tanks as they had riveted boilers. Like the later C11s, they started service with boilers pressed to 200 lb.

Information from Ejii Nozawa's web site ([]) notes that C10s were built in the one year (1930) by Kawasaki and KSK.

Note that from 1931 on heating surface areas on Japanese locomotives were calculated on the fire side of the tubes and flues. This followed German practice. A direct comparison with surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.


Class C11 (Locobase 2878)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 27 September 2015.

Branch-line passenger engine built from 1932 through World War II to 1947. Despite a shorter wheelbase, the C11s had a lower axle loading, possibly because some of the longitudinal boiler joints that had been riveted jwere replaced by welded bonds.

Information from Ejii Nozawa's web site ([]) notes that C10s were built by Hitachi, Kawasaki, KSK, and Nippon

A direct comparison with tube & flue heating surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.


Class C11/141 (Locobase 3825)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged.

Branch-line passenger engine built from 1932 through World War II to 1947.

This later group of C11s was heavier in all weights -- adhesion, engine, and axle loading. The coupled wheelbase was shorter, while the engine wheelbase grew by Firebox heating surface includes 11.8 sq ft (1.1 sq m) of arch tubes.

Information from Ejii Nozawa's web site ([]) notes that C11s were built by Hitachi, Kawasaki, KSK, and Nippon.

Information from Ejii Nozawa's web site ([]) notes that C11s were built by Hitachi, Kawasaki, KSK, and Nippon.

A direct comparison with tube & flue heating surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassC10C11C11/141
Locobase ID3824 2878 3825
RailroadJapanese Government Railways (JGR)Japanese Government Railways (JGR)Japanese Government Railways (JGR)
CountryJapanJapanJapan
Whyte2-6-4T2-6-4T2-6-4T
Number in Class23140241
Road NumbersC10.01-C10.23C11 1- C11 140C11 141 - C11-381
Gauge3'6"3'6"3'6"
Number Built23140241
Builderseveralseveralseveral
Year193019321932
Valve GearWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.78 / 4.2013.45 / 4.1013.45 / 4.10
Engine Wheelbase (ft / m)32.64 / 9.9534.65 / 10.5634.65 / 10.56
Ratio of driving wheelbase to overall engine wheelbase 0.42 0.39 0.39
Overall Wheelbase (engine & tender) (ft / m)32.64 / 9.9534.65 / 10.5634.65 / 10.56
Axle Loading (Maximum Weight per Axle) (lbs / kg)27,558 / 12,50026,963 / 12,23028,947 / 13,130
Weight on Drivers (lbs / kg)83,357 / 37,81081,461 / 36,95086,840 / 39,390
Engine Weight (lbs / kg)153,662 / 69,700145,174 / 65,850150,046 / 68,060
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)153,662 / 69,700145,174 / 65,850150,046 / 68,060
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)46 / 2345 / 22.5048 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)59.80 / 152059.80 / 152059.80 / 1520
Boiler Pressure (psi / kPa)213.20 / 14.70214.70 / 14.80214.70 / 14.80
High Pressure Cylinders (dia x stroke) (in / mm)17.72" x 24.02" / 450x61017.72" x 24.02" / 450x61017.72" x 24.02" / 450x610
Tractive Effort (lbs / kg)22,856 / 10367.3223,017 / 10440.3523,017 / 10440.35
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.65 3.54 3.77
Heating Ability
Tubes (number - dia) (in / mm)95 - 1.575" / 4087 - 1.575" / 4087 - 1.575" / 40
Flues (number - dia) (in / mm)22 - 4.685" / 11924 - 4.685" / 11924 - 4.685" / 119
Flue/Tube length (ft / m)10.50 / 3.2010.50 / 3.2010.50 / 3.20
Firebox Area (sq ft / m2)119.48 / 11.10119.48 / 11.10119.48 / 11.10
Grate Area (sq ft / m2)17.22 / 1.6017.22 / 1.6017.22 / 1.60
Evaporative Heating Surface (sq ft / m2)808 / 75.10800 / 74.30800 / 74.30
Superheating Surface (sq ft / m2)295 / 27.40321 / 29.80321 / 29.80
Combined Heating Surface (sq ft / m2)1103 / 102.501121 / 104.101121 / 104.10
Evaporative Heating Surface/Cylinder Volume117.85116.68116.68
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation367136973697
Same as above plus superheater percentage466347694769
Same as above but substitute firebox area for grate area32,35133,09233,092
Power L112,58413,37813,378
Power MT998.461086.171018.89

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