Unspecified 4-4-2 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class BESA/AP (Locobase 4258)

Data from [] (30 June 2003); and "The Work of the British Engineering Standards Association as Applied to Locomotives and Rolling Stock: The Standardization of Locomotives for Indian Railways", Locomotive Magazine, Volume XXV [25] (15 August 1919), pp. 120-123.

These Atlantic Passenger (AP) locomotives were part of the series of engines designed by the British Engineering Standards Association for Indian railways in the first decade of the 20th century. (See Locobase 10624 for the GIPR variant.) Like all broad-gauge BESA designs, these had Belpaire fireboxes. The LM account explained that the Belpaire firebox afforded "more steam and water capacity than the usual ...semi-circular outside firebox casing" as well as permitting "lighter direct staying instead of heavy girder stays."

LM noted that these Atlantics shared many components with the 4-6-0s. Both were designed to use either Stephenson link or Walschaert's outside constant-lead radial valve gear to actuate the slide valves. LM added that Walschaert gear had "been more generally adopted."

See the HP 4-6-0 (Locobase 4241) for full description of the BESA intention and varying views of its utility.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID4258
Number in Class
Road Numbers
Number Built
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.75 / 3.89
Engine Wheelbase (ft / m)27.25 / 8.31
Ratio of driving wheelbase to overall engine wheelbase 0.47
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,200 / 17,781
Weight on Drivers (lbs / kg)78,400 / 35,562
Engine Weight (lbs / kg)150,080 / 68,075
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)65 / 32.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78 / 1981
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19.25" x 26" / 489x660
Tractive Effort (lbs / kg)18,899 / 8572.45
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Tubes (number - dia) (in / mm)196 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)15.87 / 4.84
Firebox Area (sq ft / m2)157 / 14.59
Grate Area (sq ft / m2)32 / 2.97
Evaporative Heating Surface (sq ft / m2)1990 / 184.88
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1990 / 184.88
Evaporative Heating Surface/Cylinder Volume227.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5760
Same as above plus superheater percentage5760
Same as above but substitute firebox area for grate area28,260
Power L17414
Power MT416.97

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