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 Sweat House Media

Locobase ID8578
RailroadBurma Railways
Number in Class20
Road Numbers
Number Built20
BuilderVulcan Foundry
Valve GearWalschaert
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 / 12.40
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 Volume221.25
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4680
Same as above plus superheater percentage5522
Same as above but substitute firebox area for grate area31,223
Power L111,237
Power MT1114.66

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