Koya 2-6-2 Locomotives in Japan

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 2911)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). Works numbers were 2740-2743. Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004.

Difference from the other small tank engines exported to Japan by Brooks in this year: In this engine the subframe stops short of the cylinders, which are bolted directly to the smokebox saddle.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2911
Number in Class4
Road Numbers1-4
Number Built4
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.33 / 3.15
Engine Wheelbase (ft / m)24.33 / 7.42
Ratio of driving wheelbase to overall engine wheelbase 0.42
Overall Wheelbase (engine & tender) (ft / m)24.33 / 7.42
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)70,000 / 31,752
Engine Weight (lbs / kg)92,000 / 41,731
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)92,000 / 41,731
Tender Water Capacity (gals / ML)1560 / 5.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.50 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559
Tractive Effort (lbs / kg)12,623 / 5725.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.55
Heating Ability
Tubes (number - dia) (in / mm)216 - 1.625" / 41
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.51 / 2.90
Firebox Area (sq ft / m2)78 / 7.25
Grate Area (sq ft / m2)14.80 / 1.38
Evaporative Heating Surface (sq ft / m2)940 / 87.36
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)940 / 87.36
Evaporative Heating Surface/Cylinder Volume208.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2220
Same as above plus superheater percentage2220
Same as above but substitute firebox area for grate area11,700
Power L13695
Power MT349.12

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