Indian State Railways 4-6-2 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class IGR/WL (Locobase 4294)

Data from . and Vulcan Foundry brochure "Indian Railways-5 ft 6 in Gauge-1955-4-6-2 WL". (Thanks to Phil Atkins's very helpful 18 June 2023 reply to a request for the WL's locomotive diagram; Locobase could not find the specifications anywhere else.) Vulcan works numbers were 6188-6197 in 1955.

According to [] (visited 14 November 2003), this was a much lighter version of the bullet-nosed WP. But the [] site says the prototype was produced by Vulcan Foundry in 1939.

Most of the class was built after World War II, at both Vulcan Foundry in Great Britain and Chittaranjan Locomotive Works in India, with the last coming in 1955. Successor to the XP, this design, according to Sundar, eliminated the earlier engine's rough-riding qualities. The outside constant-lead valve gear actuated 11" (279 mm) piston valves. Some of the very high firebox heating surface area came from its combustion chamber, one thermic syphon, and two arch tubes.

Vulcan's ten engines split with five going to the Northern Railway and five to the Southern Railway. Although all ten arrived with roller bearings in all axleboxes, five used Timkens, the other five Skefcos.

A WL was the last locomotive to pull an Indian broad-gauge train in scheduled service -- the date was December 1995.

Heating surface data originally from tables created by Dr. Jonathan Smith of Iowa State and hosted on [] ...(10 December 2004).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID4294
RailroadIndian State Railways
Number in Class104
Road Numbers14,000
Number Built104
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)34.75 / 10.59
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)64.84 / 19.76
Axle Loading (Maximum Weight per Axle) (lbs / kg)38,080 / 17,273
Weight on Drivers (lbs / kg)111,104 / 50,396
Engine Weight (lbs / kg)197,344 / 89,514
Tender Loaded Weight (lbs / kg)140,196 / 63,592
Total Engine and Tender Weight (lbs / kg)337,540 / 153,106
Tender Water Capacity (gals / ML)5400 / 20.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)13.20 / 12
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)67 / 1702
Boiler Pressure (psi / kPa)210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)19.25" x 28" / 489x711
Tractive Effort (lbs / kg)27,643 / 12538.67
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.02
Heating Ability
Tubes (number - dia) (in / mm)92 - 2" / 51
Flues (number - dia) (in / mm)30 - 5.25" / 133
Flue/Tube length (ft / m)14.89 / 4.54
Firebox Area (sq ft / m2)251.10 / 23.33
Grate Area (sq ft / m2)38 / 3.53
Evaporative Heating Surface (sq ft / m2)1613 / 149.85
Superheating Surface (sq ft / m2)450 / 41.81
Combined Heating Surface (sq ft / m2)2063 / 191.66
Evaporative Heating Surface/Cylinder Volume171.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7980
Same as above plus superheater percentage9736
Same as above but substitute firebox area for grate area64,332
Power L117,201
Power MT1023.95

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