Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. Information from Ejii Nozawa's web site ([
]) gives number, site, date of construction.
Post-World War II tank engine design that was the only one of its arrangement ever built. The boiler was that of the D51 Mikado with fewer, shorter tubes and a slightly larger grate. The incredibly low factor of adhesion suggests one reason why this engine was not repeated.
Because the measurements above represent the fire side of tubes and flues, 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 Middle Run Media | |
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Class | E10 |
Locobase ID | 2493 |
Railroad | Japanese Government Railways (JGR) |
Country | Japan |
Whyte | 2-10-4T |
Number in Class | 5 |
Road Numbers | |
Gauge | 3'6" |
Number Built | 5 |
Builder | KSK |
Year | 1947 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 19.03 / 5.80 |
Engine Wheelbase (ft / m) | 38.62 / 11.77 |
Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 31,063 / 14,090 |
Weight on Drivers (lbs / kg) | 155,360 / 70,470 |
Engine Weight (lbs / kg) | 225,092 / 102,100 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 2091 / 7.92 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.50 / 4 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 49.20 / 1250 |
Boiler Pressure (psi / kPa) | 227.70 / 1570 |
High Pressure Cylinders (dia x stroke) (in / mm) | 21.65" x 25.98" / 550x660 |
Tractive Effort (lbs / kg) | 47,904 / 21728.91 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.24 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 74 - 2.008" / 51 |
Flues (number - dia) (in / mm) | 35 - 5.157" / 131 |
Flue/Tube length (ft / m) | 16.40 / 5 |
Firebox Area (sq ft / m2) | 154.94 / 14.40 |
Grate Area (sq ft / m2) | 35.51 / 3.30 |
Evaporative Heating Surface (sq ft / m2) | 1568 / 145.70 |
Superheating Surface (sq ft / m2) | 833 / 77.40 |
Combined Heating Surface (sq ft / m2) | 2401 / 223.10 |
Evaporative Heating Surface/Cylinder Volume | 141.65 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 8086 |
Same as above plus superheater percentage | 10,916 |
Same as above but substitute firebox area for grate area | 47,628 |
Power L1 | 16,597 |
Power MT | 1177.59 |