Data from Wikipedia's "Sentetsu Tehoro-class locomotive", last accessed at [] on 1 March 2020. Gyeongseong Works produced 2 prototypes and 13 production machines. Hitachi's Kasato works manufactured the most of the three Japanese builders with Kawasaki and Mitsubishi adding 13 others.
The Tehoro class represented the first domestically produced . It improved on Baldwin's 1913 Tehoi class (Locobase 14221) prinicipally in offering more heating surface and grate areas, adding a superheater, an automated fire dore and other improvements.
Wikipedia sets its place in Korean railway history as follows: "The Tehoro class was a notable milestone in the history of Korea's railways. As the first type designed and produced entirely by domestic (Korean and Japanese) factories, it gave Japanese and Korean designers extensive experience which was subsequently applied to the development of the Pashishi and Mikasa-class."
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Tehoro |
| Locobase ID | 20723 |
| Railroad | Chosen Government (Sentetsu) |
| Country | Korea |
| Whyte | 4-6-0 |
| Number in Class | 95 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 95 |
| Builder | several |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | 170,197 / 77,200 |
| Tender Loaded Weight (lbs / kg) | 119,049 / 54,000 |
| Total Engine and Tender Weight (lbs / kg) | 289,246 / 131,200 |
| Tender Water Capacity (gals / ML) | 5280 / 20 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10.50 / 10 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66.10 / 1680 |
| Boiler Pressure (psi / kPa) | 178.40 / 1230 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.87" x 25.98" / 530x660 |
| Tractive Effort (lbs / kg) | 25,960 / 11775.27 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 150 - 2.008" / 51 |
| Flues (number - dia) (in / mm) | 24 - 5.394" / 137 |
| Flue/Tube length (ft / m) | 15.16 / 4.62 |
| Firebox Area (sq ft / m2) | 129.17 / 12 |
| Grate Area (sq ft / m2) | 46.93 / 4.36 |
| Evaporative Heating Surface (sq ft / m2) | 1838 / 170.80 |
| Superheating Surface (sq ft / m2) | 498 / 46.30 |
| Combined Heating Surface (sq ft / m2) | 2336 / 217.10 |
| Evaporative Heating Surface/Cylinder Volume | 178.68 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8372 |
| Same as above plus superheater percentage | 10,130 |
| Same as above but substitute firebox area for grate area | 27,883 |
| Power L1 | 13,309 |
| Power MT | |