Burma Railways 4-6-2 Locomotives in Burma
Class Details by Steve Llanso of Sweat House Media
Class IRS/YB (Locobase 8585)
Data from [
], last accessed 15 July 2007.
The Vulcan Foundry magazine explained that the destruction of the Burmese railway system from 1941-1945 was so extensive that it had to be rebuilt from scratch. In support of that effort was the fulfillment of this order of Pacific that were based on the Indian Railway Standard light Pacific design.
Compared to the Japanese 4-6-2s that ran on these rails during World War Two, the YBs were smaller and lighter.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | IRS/YB |
| Locobase ID | 8585 |
| Railroad | Burma Railways |
| Country | Burma |
| Whyte | 4-6-2 |
| Number in Class | 50 |
| Road Numbers | |
| Gauge | Metre |
| Number Built | 50 |
| Builder | Vulcan Foundry |
| Year | 1947 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 10.50 / 3.20 |
| Engine Wheelbase (ft / m) | 27.83 / 8.48 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 50 / 15.24 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 22,400 / 10,160 |
| Weight on Drivers (lbs / kg) | 67,200 / 30,481 |
| Engine Weight (lbs / kg) | 115,920 / 52,580 |
| Tender Loaded Weight (lbs / kg) | 87,920 / 39,880 |
| Total Engine and Tender Weight (lbs / kg) | 203,840 / 92,460 |
| Tender Water Capacity (gals / ML) | 3600 / 13.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8.80 / 8 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 37 / 18.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 16,492 / 7480.65 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.07 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 68 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 18 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 15 / 4.57 |
| Firebox Area (sq ft / m2) | 136.50 / 12.69 |
| Grate Area (sq ft / m2) | 23.10 / 2.15 |
| Evaporative Heating Surface (sq ft / m2) | 1109 / 103.07 |
| Superheating Surface (sq ft / m2) | 265 / 24.63 |
| Combined Heating Surface (sq ft / m2) | 1374 / 127.70 |
| Evaporative Heating Surface/Cylinder Volume | 198.57 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4158 |
| Same as above plus superheater percentage | 4948 |
| Same as above but substitute firebox area for grate area | 29,238 |
| Power L1 | 12,787 |
| Power MT | 1258.50 |