Burma Railways 2-8-2 Locomotives in Burma
Class Details by Steve Llanso of Sweat House Media
Class IRS/YD (Locobase 8578)
Data from [
], a reprint of the Vulcan magazine for Winter 1949, which describes Vulcan's delivery of 44 of these Mikados. They were part of a series of designs created in the mid-1920s to meet Indian railway requirements. This is the metere-gauge goods locomotive. Of this particular order, 20 went into Burmese service while 24 more went to two Indian railways (see Locobase 4275).
[
] notes that these had "...a wider firebox and other improvements to handle low-grade coal." As with many of these colonial locomotives, the Vulcans had Belpaire fireboxes.
NB: Tube length is an estimate based on the calculation of tube surface area by subtracting reported firebox heating surface from reported total evaporative heating surface
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | IRS/YD |
| Locobase ID | 8578 |
| Railroad | Burma Railways |
| Country | Burma |
| Whyte | 2-8-2 |
| Number in Class | 20 |
| Road Numbers | |
| Gauge | Metre |
| Number Built | 20 |
| Builder | Vulcan Foundry |
| Year | 1949 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.42 / 4.09 |
| Engine Wheelbase (ft / m) | 27.75 / 8.46 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 88,900 / 40,324 |
| Engine Weight (lbs / kg) | 126,784 / 57,508 |
| Tender Loaded Weight (lbs / kg) | 87,836 / 39,842 |
| Total Engine and Tender Weight (lbs / kg) | 214,620 / 97,350 |
| Tender Water Capacity (gals / ML) | 3600 / 13.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 9 / 8 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 37 / 18.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 |
| Tractive Effort (lbs / kg) | 22,109 / 10028.49 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 92 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 21 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 15.17 |
| Firebox Area (sq ft / m2) | 147 / 13.66 |
| Grate Area (sq ft / m2) | 26 / 2.42 |
| Evaporative Heating Surface (sq ft / m2) | 1395 / 129.65 |
| Superheating Surface (sq ft / m2) | 310 / 28.81 |
| Combined Heating Surface (sq ft / m2) | 1705 / 158.46 |
| Evaporative Heating Surface/Cylinder Volume | 221.25 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4680 |
| Same as above plus superheater percentage | 5522 |
| Same as above but substitute firebox area for grate area | 31,223 |
| Power L1 | 11,237 |
| Power MT | 1114.66 |