Burma Railways 4-6-4 Locomotives in Burma
Class Details by Steve Llanso of Sweat House Media
Class As (Locobase 7502)
Data from 1946 Beyer, Peacock catalogue hosted on Martyn Bane's website at [
] (accessed 21 May 2006); and "Suburban Tank Class As", Burma Railway Locomotive Diagrams supplied in May 2020 by Allen Stanley from his extensive Rail Data Exchange collection. Builders numbers were 5922-5929.
Slender-barrelled double-ender with a Belpaire firebox behind the side tanks. The firebox rode between the last two driving axles.
Class PT (Locobase 13277)
Data from diagram posted on [],4200476, last accessed 18 October 2011.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | As | PT |
| Locobase ID | 7502 | 13277 |
| Railroad | Burma Railways | Burma Railways |
| Country | Burma | Burma |
| Whyte | 4-6-4T | 4-6-4T |
| Number in Class | 8 | 8 |
| Road Numbers | ||
| Gauge | Metre | Metre |
| Number Built | 8 | 8 |
| Builder | Beyer, Peacock | |
| Year | 1916 | 1916 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 12 / 3.66 | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 30.17 / 9.20 | 31 / 9.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.40 | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 30.17 / 9.20 | 31 / 9.45 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 22,176 / 10,059 | 24,640 / 11,177 |
| Weight on Drivers (lbs / kg) | 66,528 / 30,177 | 73,920 / 33,530 |
| Engine Weight (lbs / kg) | 135,296 / 61,369 | 141,120 / 64,011 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | 135,296 / 61,369 | 141,120 / 64,011 |
| Tender Water Capacity (gals / ML) | 1320 / 5 | 1440 / 5.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.20 / 3 | 3.30 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 37 / 18.50 | 41 / 20.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 48 / 1219 | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 184.20 / 1270 | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 | 14.75" x 24" / 375x610 |
| Tractive Effort (lbs / kg) | 16,146 / 7323.71 | 16,644 / 7549.60 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.12 | 4.44 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 90 - 1.75" / 44 | 100 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 12 - 5.25" / 133 | 21 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 11.82 / 3.60 | 11 / 3.35 |
| Firebox Area (sq ft / m2) | 100 / 9.29 | |
| Grate Area (sq ft / m2) | 15.40 / 1.43 | 24 / 2.23 |
| Evaporative Heating Surface (sq ft / m2) | 782 / 72.65 | |
| Superheating Surface (sq ft / m2) | 156 / 14.49 | |
| Combined Heating Surface (sq ft / m2) | 938 / 87.14 | |
| Evaporative Heating Surface/Cylinder Volume | 173.79 | |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2837 | 4320 |
| Same as above plus superheater percentage | 3319 | 4320 |
| Same as above but substitute firebox area for grate area | 21,551 | |
| Power L1 | 8796 | |
| Power MT | 874.45 | |