Indian Midland 2-6-0 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class F4 (Locobase 10326)

Data from "Recent Locomotives for India and South Africa," The Locomotive Magazine, Vol IX (5 September 1903), p. 146. (Thanks to Abhijit Gore for his 2 January 2021 email supplying all the builders, builder's numbers, and road number -- very useful information.)

Works numbers were Neilson, Reid & Co (works numbers were 5908-5932 in 1901, road numbers 180-204), Sharp, Stewart & Co (works numbers 4982-4993 in 1903, road numbers 205-2016), and North British Locomotive Company---not long after Neilson, Reid; Sharp, Stewar; and Dubs & Company combined to form NBLC-- (works numbers 15768-15782 in 1903, road numbers 217-231).

Indian Midland operated this design as its standard goods locomotive, a service it would continue to perform when the IM was incorporated into the Great Indian Peninsular Railway. The profile shows a locomotive with a slender dome over the center coupled axle, a large-diameter leading wheel in the front truck, and a generally sturdy look. Although earlier IMRwy F2 and F3 class Moguls had Belpaire fireboxes, this class did not.

Although a large IM class, the engines only wore that livery briefly. In 1904, the IM was merged with the Great Indian Peninsula Railway, which led to adding 1,000 to each of the locomotives' road numbers.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10326
RailroadIndian Midland (GIP)
Number in Class52
Road Numbers180-231/1180-1231
Number Built52
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.96
Engine Wheelbase (ft / m)18.67 / 5.69
Ratio of driving wheelbase to overall engine wheelbase 0.70
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)30,688 / 13,920
Weight on Drivers (lbs / kg)89,376 / 40,540
Engine Weight (lbs / kg)108,416 / 49,177
Tender Loaded Weight (lbs / kg)88,368 / 40,083
Total Engine and Tender Weight (lbs / kg)196,784 / 89,260
Tender Water Capacity (gals / ML)3600 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54.50 / 1384
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18.5" x 26" / 470x660
Tractive Effort (lbs / kg)24,981 / 11331.20
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.58
Heating Ability
Tubes (number - dia) (in / mm)224 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)103 / 9.57
Grate Area (sq ft / m2)21.25 / 1.97
Evaporative Heating Surface (sq ft / m2)1238 / 115.06
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1238 / 115.06
Evaporative Heating Surface/Cylinder Volume153.05
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3825
Same as above plus superheater percentage3825
Same as above but substitute firebox area for grate area18,540
Power L13543
Power MT262.18

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Wes Barris