Data from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Vol 60, p. 81+. Works numbers were 41474 in June 1914, 45244-45245 in June 1917, 46765-46766 in October, 53803 and 53831 in October 1920.
Already in use as a horse tramway, the Fuji Minobu line, Located in Minamikoma District, Yamanashi Prefecture, began steam operations in 1912. The steam railway extended 26.9 miles (43.3 km) to Minobu by 1920. It had gentle curves (minimum 660 feet (201 metres or radii of 8.7 degrees) on 60 lb/yard (30kg/metre) rails, but maximum grades as steep as 2 1/2%.
The first of the set of Baldwins bought for this railway weighed 2,500 lb (1,134 kg) less on the drivers and 6,500 lb (2,948 kg) less for the locomotive as a whole. The 1917 weight gain resulted from a need to accommodate a two-ton coal box. (The 1920 engine weights fell between the two at 63,500 lb adhesion and 85,000 lb total.) Otherwise, all of the locomotives were identical.
Electrification began in 1927, which most likely made these little Prairie tanks redundant.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 14605 |
| Railroad | Fuji Minobu |
| Country | Japan |
| Whyte | 2-6-2T |
| Number in Class | 7 |
| Road Numbers | 4, 12-14, 11, 15-16 |
| Gauge | 3'6" |
| Number Built | 7 |
| Builder | Baldwin |
| Year | 1914 |
| Valve Gear | Stephenson |
| 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) | 65,500 / 28,576 |
| Engine Weight (lbs / kg) | 90,500 / 38,102 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 90,500 / 38,102 |
| 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) | 36 / 18 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| 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) | 4.71 |
| 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 Volume | 172.10 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2560 |
| Same as above plus superheater percentage | 2560 |
| Same as above but substitute firebox area for grate area | 11,520 |
| Power L1 | 3052 |
| Power MT | 308.18 |