Data from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Vol 60, p. 102+. Works numbers were 53696-53697, 53700 in September 1920.
As with the other Prairie tanks supplied to small Japanese railways at this time, the Joso tanks were ticketed for 60 lb/yard (30 kg/metre) rail, maximum grades of 2 1/2%, curve radii of 660 feet (201 metres) or 8.7%. The Joso opened in 1913 and began at Toride, 27.2 miles (43.8 km) from Tokyo. It headed toward Shimodate 31.9 miles (51.4 km) away.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 14612 |
| Railroad | Joso |
| Country | Japan |
| Whyte | 2-6-2T |
| Number in Class | 3 |
| Road Numbers | 1, 7, 9 |
| Gauge | 3'6" |
| Number Built | 3 |
| Builder | Baldwin |
| Year | 1920 |
| 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) | 21,280 / 9652 |
| Weight on Drivers (lbs / kg) | 64,200 / 29,121 |
| Engine Weight (lbs / kg) | 88,600 / 40,188 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| 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) | 4.62 |
| 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 | 314.42 |