UNRRA 2-8-0 Locomotives in China
Class Details by Steve Llanso of Sweat House Media
Class KD7 (Locobase 950)
Some data from 1947 Locomotive Cyclopedia. Additional data and description from [
], accessed 4 March 2006, a website devoted to Chinese steam run by Site Owner Duncan Cotterill. Also see
[] (last accessed 4 March 2006) by Ejii Nozawa works numbers were 73247-73326 in 1946.
These engines were built for the UNRRA, (United Nations Relief and Rehabilitation Agency) by Alco, Baldwin, and Lima. Of the total, 160 were delivered to the Chinese Railways in 1946-1947 and numbered KD7 001 - KD7 160. Others went to Belgium as their Type 29.
According to Cotterill, this "thoroughly modern" class was highly regarded by its crews. The relatively tall drivers permitted maximum speeds of 90 km/h (54 mph).
The last of the class was retired in 1988.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | KD7 |
| Locobase ID | 950 |
| Railroad | UNRRA |
| Country | China |
| Whyte | 2-8-0 |
| Number in Class | 160 |
| Road Numbers | 1036-1115+ |
| Gauge | Std |
| Number Built | 160 |
| Builder | several |
| Year | 1946 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 18.25 / 5.56 |
| Engine Wheelbase (ft / m) | 27.59 / 8.41 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.66 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 172,500 / 78,245 |
| Engine Weight (lbs / kg) | 203,000 / 92,079 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 6605 / 25.02 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12.60 / 12 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 72 / 36 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 229.20 / 1580 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 44,003 / 19959.45 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.92 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 44.80 / 4.16 |
| Evaporative Heating Surface (sq ft / m2) | 2033 / 188.87 |
| Superheating Surface (sq ft / m2) | 727 / 67.54 |
| Combined Heating Surface (sq ft / m2) | 2760 / 256.41 |
| Evaporative Heating Surface/Cylinder Volume | 165.03 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,268 |
| Same as above plus superheater percentage | 12,938 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |