Burma Railways locomotive diagrams posted on Flicker by Florian Grupp, last accessed 3 March 2012. See also "Tank Locomotive, Burma Railway", The Locomotive, Volume XVI [16] (15 February 1910), p. 32.
Especially for a metre-gauge railway, this was a big radial tank. Certainly the photo suggests as much when one compares the chap in the bowler with the cab and the boiler. The Locomotive Magazine article contended the Belpaire firebox area was of "exceptional dimensions".
Data from "Burma Railways Co. Ltd. Type 2.6.2", Locomotives Manufactured by Messrs Kitson & Co Ltd, Leeds.. Works numbers were 4991-4993 in 1913.
Produced four years after the BR took delivery of a quartet of Prairie tanks (Locobase 13916), Kitson's trio were slightly smaller. They deployed the same power dimensions of cylinder volume, boiler pressure, and wheel diameter, but scaled back the grate area and tube count. The firebox's heating surface area remained unchanged.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | M | M |
| Locobase ID | 13916 | 20996 |
| Railroad | Burma Railways | Burma Railways |
| Country | Burma | Burma |
| Whyte | 2-6-2T | 2-6-2T |
| Number in Class | 4 | 3 |
| Road Numbers | 338-341 | 388-390 |
| Gauge | Metre | Metre |
| Number Built | 4 | 3 |
| Builder | North British | Kitson & Co |
| Year | 1909 | 1913 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 10 / 3.05 | 10 / 3.05 |
| Engine Wheelbase (ft / m) | 24 / 7.32 | 24 / 7.32 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.42 | 0.42 |
| Overall Wheelbase (engine & tender) (ft / m) | 24 / 7.32 | 24 / 7.32 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,520 / 10,669 | |
| Weight on Drivers (lbs / kg) | 69,664 / 31,599 | 66,192 / 30,024 |
| Engine Weight (lbs / kg) | 104,496 / 47,399 | 99,902 / 45,315 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | 104,496 / 47,399 | 99,902 / 45,315 |
| Tender Water Capacity (gals / ML) | 960 / 3.64 | 960 / 3.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 | 1.90 / 1.70 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 | 37 / 18.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 43 / 1092 | 43 / 1092 |
| Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 | 15" x 22" / 381x559 |
| Tractive Effort (lbs / kg) | 17,613 / 7989.13 | 17,613 / 7989.13 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.96 | 3.76 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 235 - 1.75" / 44 | |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 9.58 / 2.92 | |
| Firebox Area (sq ft / m2) | 100 / 9.29 | 100 / 9.29 |
| Grate Area (sq ft / m2) | 13.40 / 1.24 | 12.75 / 1.18 |
| Evaporative Heating Surface (sq ft / m2) | 1131 / 105.07 | 1026 / 95.32 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 1131 / 105.07 | 1026 / 95.32 |
| Evaporative Heating Surface/Cylinder Volume | 251.35 | 228.02 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2412 | 2295 |
| Same as above plus superheater percentage | 2412 | 2295 |
| Same as above but substitute firebox area for grate area | 18,000 | 18,000 |
| Power L1 | 4676 | 4375 |
| Power MT | 443.94 | 437.15 |