Data from "Sentetsu Tehosa-class locomotiv" in Wikipedia at [], last accessed 13 July 2023.
Baldwin's 1907 Teho-class Ten-wheel passenger engines (Locobase 13143) arrived as saturated-boiler. Eight years later, this nonet from Dunkirk, New York provided another option to the Chosen railway
Wikipedia's entry for this class includes some confusing heating surface data.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 49, p. 200. Works numbers were 38699-38710 in November 1912.
The 45 sq ft (4.18 sq m) in the combustion chamber contributed more than 20% to the direct heating surface.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | Tehosa | Tehoshi/Tehoi |
| Locobase ID | 21139 | 14221 |
| Railroad | Chosen Government Railway | Chosen Government Railway |
| Country | Korea | Korea |
| Whyte | 4-6-0 | 4-6-0 |
| Number in Class | 9 | 12 |
| Road Numbers | 222-230/651-659 | 231-242 |
| Gauge | Std | Std |
| Number Built | 9 | 12 |
| Builder | Alco-Brooks | Baldwin |
| Year | 1914 | 1912 |
| Valve Gear | Stephenson | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 13.48 / 4.11 | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 24.34 / 7.42 | 24.35 / 7.42 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.55 | 0.55 |
| Overall Wheelbase (engine & tender) (ft / m) | 44.69 / 13.62 | 53.17 / 16.21 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 37,334 / 16,934 | |
| Weight on Drivers (lbs / kg) | 111,999 / 50,802 | 112,000 / 50,802 |
| Engine Weight (lbs / kg) | 148,001 / 67,132 | 150,000 / 68,039 |
| Tender Loaded Weight (lbs / kg) | 95,813 / 43,460 | 85,000 / 38,555 |
| Total Engine and Tender Weight (lbs / kg) | 243,814 / 110,592 | 235,000 / 106,594 |
| Tender Water Capacity (gals / ML) | 3986 / 15.10 | 3984 / 15.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.50 / 5.90 | 6.60 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 62 / 31 | 62 / 31 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 66.10 / 1680 | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 182.70 / 1260 | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.08" x 25.98" / 510x660 | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 24,611 / 11163.38 | 24,109 / 10935.67 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.55 | 4.65 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 210 - 2.244" / 57 | 264 - 2" / 51 |
| Flues (number - dia) (in / mm) | 24 - 5.394" / 137 | |
| Flue/Tube length (ft / m) | 15.09 / 4.60 | 12.25 / 3.73 |
| Firebox Area (sq ft / m2) | 129.17 / 12 | 180 / 16.72 |
| Grate Area (sq ft / m2) | 47.25 / 4.39 | 40 / 3.72 |
| Evaporative Heating Surface (sq ft / m2) | 1849 / 171.80 | 1862 / 172.98 |
| Superheating Surface (sq ft / m2) | 505 / 46.90 | |
| Combined Heating Surface (sq ft / m2) | 2354 / 218.70 | 1862 / 172.98 |
| Evaporative Heating Surface/Cylinder Volume | 194.18 | 196.96 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 8633 | 7200 |
| Same as above plus superheater percentage | 10,445 | 7200 |
| Same as above but substitute firebox area for grate area | 28,555 | 32,400 |
| Power L1 | 14,880 | 5785 |
| Power MT | 878.71 | 341.62 |