Data from "Baldwin Balanced Compound, Seoul Fusan Railroad", Railway Master Mechanic, Volume XXX [30], No 4 (April 1906), pp. 112-113. See also DeGolyer, Volume 27, p. 109. Works numbers were 24629, 24630, 24661, 24669-24670, 24693 in September 1904.
This sextet was half of the passenger stud built by Baldwin for this Asian peninsula's railway. Ruling grades on the line ran up to 1 in 60 (1.67%) and the sharpest curves measured a relatively gentle 15 chains (990 ft/301.75 m). Typical rail weight ran 75 lb/yard (37.5 kg/metre) and 14 sleepers supported each 30 ft (9.14 m) section.
Six other locomotives fitted with fewer boiler tubes of larger diameter were produced in 1906 as balanced compounds. They're shown in Locobase 10814.
Data from "Baldwin Balanced Compound, Seoul Fusan Railroad", Railway Master Mechanic, Vol XXX, # 4 (April 1906), pp. 112-113. See also DeGolyer, Volume 28, p. 213. Works numbers were 27291-27292, 27331-27332, 27377-27378 in January 1906.
Other than substituting a balanced -compound cylinder layout, this class of six locomotives was claimed by the RMM report to be identical to the six simple-expansion described in Locobase 10813. Even disregarding the cylinder arrangements, the 301s manifested several changes. Grate and firebox areas were identical, but Baldwin replaced the 201 class's 310 two-inch (50.8 mm) diameter, 15' 2" (4.62 m) long tubes with the 233 2 1/4" tubes shown in the specs above. To achieve the same heating surface area/grate area ratio, the builder lengthened each 2 1/4" tube by 22 1/2" (572 mm) compared to the earlier engines. Boiler pressure was set 20 psi higher, a typical difference between compound and simple-expansion locomotives.
According to the RMM, "They are able to exert a drawbar pull of 24,000 Ibs., and having an adhesion co-efficient of 4.9, they will always be free from the aspersion of being over-cylindered, even under the limit of tire and cylinder wear." Baldwin's specs noted a requirement to haul 10 or 12 cars at an average speed of 20 to 24 mph (32 to 39 kph).
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 201 | Tehosa/Tehoi-3/Tehou |
| Locobase ID | 10813 | 10814 |
| Railroad | Seoul Fusan | Seoul Fusan |
| Country | Korea | Korea |
| Whyte | 4-6-0 | 4-6-0 |
| Number in Class | 6 | 6 |
| Road Numbers | 201-206 | 301-306 |
| Gauge | Std | Std |
| Number Built | 6 | 6 |
| Builder | Burnham, Williams & Co | Burnham, Williams & Co |
| Year | 1904 | 1906 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 13.50 / 4.11 | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 27.42 / 8.36 | 27.42 / 8.36 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 55 / 16.76 | 55 / 16.76 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 112,000 / 50,802 | 118,000 / 53,524 |
| Engine Weight (lbs / kg) | 148,000 / 67,132 | 162,000 / 73,482 |
| Tender Loaded Weight (lbs / kg) | 78,000 / 35,380 | 78,000 / 35,380 |
| Total Engine and Tender Weight (lbs / kg) | 226,000 / 102,512 | 240,000 / 108,862 |
| Tender Water Capacity (gals / ML) | 4000 / 15.15 | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4 / 4 | 4 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 62 / 31 | 66 / 33 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 66 / 1676 | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 180.40 / 1240 | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 | 15" x 26" / 381x660 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 25" x 26" / 635x660 | |
| Tractive Effort (lbs / kg) | 24,163 / 10960.17 | 22,159 / 10051.17 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.64 | 5.33 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 310 - 2" / 51 | 233 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 15.17 / 4.62 | 18.12 / 5.52 |
| Firebox Area (sq ft / m2) | 131.70 / 12.24 | 131.70 / 12.24 |
| Grate Area (sq ft / m2) | 40 / 3.72 | 40 / 3.72 |
| Evaporative Heating Surface (sq ft / m2) | 2580 / 239.69 | 2608 / 242.38 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 2580 / 239.69 | 2608 / 242.38 |
| Evaporative Heating Surface/Cylinder Volume | 272.90 | 490.43 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 7216 | 8000 |
| Same as above plus superheater percentage | 7216 | 8000 |
| Same as above but substitute firebox area for grate area | 23,759 | 26,340 |
| Power L1 | 6798 | 4865 |
| Power MT | 401.44 | 272.68 |