Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 60, p. 133. Works numbers were 50997-50998 in December 1912; 51122-51126, 51176-51179 in January 1919; 51196 in February
The SM's Chosen Lines ordered Pacifics and these Mikados with very similar boilers that differed principally in the 2-8-2s' longer tubes. 25 sq ft (2.3 sq m) of arch tubes contributed to the direct heating surface area. Lower drivers offset the smaller cylinder volume to generate more tractive effort. Thirteen-inch (331 mm) piston valves supplied steam to those cylinders.
Probably because the rail weight amounted to a relatively lean 80-lb/yard (40-kg/metre), this was one of the lightest standard-gauge Mikados built during that period.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 701 |
| Locobase ID | 13139 |
| Railroad | South Manchuria - Chosen |
| Country | Korea |
| Whyte | 2-8-2 |
| Number in Class | 12 |
| Road Numbers | 701-712 |
| Gauge | Std |
| Number Built | 12 |
| Builder | Baldwin |
| Year | 1918 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15 / 4.57 |
| Engine Wheelbase (ft / m) | 31.67 / 9.65 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.47 |
| Overall Wheelbase (engine & tender) (ft / m) | 63.06 / 19.22 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 40,000 |
| Weight on Drivers (lbs / kg) | 154,000 / 69,853 |
| Engine Weight (lbs / kg) | 198,000 / 89,811 |
| Tender Loaded Weight (lbs / kg) | 115,000 / 52,163 |
| Total Engine and Tender Weight (lbs / kg) | 313,000 / 141,974 |
| Tender Water Capacity (gals / ML) | 6000 / 22.73 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 14 / 13 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 64 / 32 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 185 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 37,387 / 16958.48 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.12 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 168 - 2" / 51 |
| Flues (number - dia) (in / mm) | 26 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 19.25 / 5.87 |
| Firebox Area (sq ft / m2) | 188 / 17.47 |
| Grate Area (sq ft / m2) | 46.70 / 4.34 |
| Evaporative Heating Surface (sq ft / m2) | 2575 / 239.31 |
| Superheating Surface (sq ft / m2) | 612 / 56.88 |
| Combined Heating Surface (sq ft / m2) | 3187 / 296.19 |
| Evaporative Heating Surface/Cylinder Volume | 209.02 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8640 |
| Same as above plus superheater percentage | 10,281 |
| Same as above but substitute firebox area for grate area | 41,388 |
| Power L1 | 12,873 |
| Power MT | 737.14 |