Indian Railways 0-4-2 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class IRS/XT (Locobase 4264)

Part of a series of designs created in the mid-1920s to meet Indian railway requirements. This light passenger engine was produced for years by several builders including the Amjer workshops in India. [] -- the website of India's National Rail Museum -- describes this engine as well.

[] notes that these had "...a wider firebox and other improvements to handle low-grade coal."

Dr. Jonathan Smith of Iowa State ([] ) for data on this design.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID4264
RailroadIndian Railways
Number in Class77
Road Numbers
Number Built77
Valve GearCaprotti
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)67,200 / 30,481
Engine Weight (lbs / kg)96,320 / 43,690
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)96,320 / 43,690
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)12" x 22" / 305x559
Tractive Effort (lbs / kg)11,088 / 5029.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.06
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)577 / 53.62
Superheating Surface (sq ft / m2)144 / 13.38
Combined Heating Surface (sq ft / m2)721 / 67
Evaporative Heating Surface/Cylinder Volume200.36
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2940
Same as above plus superheater percentage3528
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris