Kominato 2-6-2 Locomotives in Japan

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 15288)

Data from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Vol 72, p. 269+. Works numbers were 57776-57777 in April 1924.

This railway cut across Bo-so- Peninsula in Chiba Prefecture from the west coast to the town of Otaki over a distance of 39.1 km (24.3 mi). Its eastern terminus was to have been the town of Kominato itself, but that plan was abandoned when the line ended at Kazusa-Nakano with a connection to the JGR's Kihara Line.

It ran under steam until the first diesel cars were introduced in 1961; the last steam engine was retired in 21 March 1962.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15288
Number in Class2
Road Numbers1-2
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.75 / 2.97
Engine Wheelbase (ft / m)22 / 6.71
Ratio of driving wheelbase to overall engine wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)22 / 6.71
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)66,000 / 29,937
Engine Weight (lbs / kg)89,000 / 40,370
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)89,000 / 40,370
Tender Water Capacity (gals / ML)1200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)13,909 / 6309.02
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.75
Heating Ability
Tubes (number - dia) (in / mm)152 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.17 / 2.80
Firebox Area (sq ft / m2)72 / 6.69
Grate Area (sq ft / m2)16 / 1.49
Evaporative Heating Surface (sq ft / m2)704 / 65.40
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)704 / 65.40
Evaporative Heating Surface/Cylinder Volume172.10
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2560
Same as above plus superheater percentage2560
Same as above but substitute firebox area for grate area11,520
Power L13052
Power MT305.84

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