Imperial Railways 0-10-0 Locomotives in Japan
Class Details by Steve Llanso of Sweat House Media
Class 4100 (Locobase 3818)
Data from Hiroshi Takagi, both from his website ([
]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged.
This was the first of three decapod tank classes. Note that the rigid wheel base actually measured 2.896 m (9 ft 6 in), which means that the end axles were radial in nature and greatly reduced the minimum curvature these locomotives could negotiate. Takagi notes that the heating surface data is from the "water side", which mirrored British-American practice.
Boiler pressure later increased to 185 psi, but these first four were not the model for the rest, as Locobase 3819 will show.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4100 |
| Locobase ID | 3818 |
| Railroad | Imperial Railways |
| Country | Japan |
| Whyte | 0-10-0T |
| Number in Class | 4 |
| Road Numbers | 4100-4103 |
| Gauge | 3'6" |
| Number Built | 4 |
| Builder | Maffei |
| Year | 1912 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 19 / 5.79 |
| Engine Wheelbase (ft / m) | 19 / 5.79 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 27,359 / 12,410 |
| Weight on Drivers (lbs / kg) | 136,819 / 62,060 |
| Engine Weight (lbs / kg) | 136,819 / 62,060 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 136,819 / 62,060 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49 / 1245 |
| Boiler Pressure (psi / kPa) | 179.80 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.98" x 24.02" / 533x610 |
| Tractive Effort (lbs / kg) | 32,976 / 14957.68 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.15 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 164 - 1.772" / 45 |
| Flues (number - dia) (in / mm) | 22 - 5" / 127 |
| Flue/Tube length (ft / m) | 10.50 / 3.20 |
| Firebox Area (sq ft / m2) | 138.91 / 12.91 |
| Grate Area (sq ft / m2) | 20.01 / 1.86 |
| Evaporative Heating Surface (sq ft / m2) | 1229 / 114.26 |
| Superheating Surface (sq ft / m2) | 321 / 29.82 |
| Combined Heating Surface (sq ft / m2) | 1550 / 144.08 |
| Evaporative Heating Surface/Cylinder Volume | 127.88 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3598 |
| Same as above plus superheater percentage | 4353 |
| Same as above but substitute firebox area for grate area | 30,221 |
| Power L1 | 7353 |
| Power MT | 592.41 |