Bombay Port Trust 2-10-2 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class H (Locobase 20313)

Data from "Ten-Coupled Tank Locomotive, Bombay Port Trust Railway", Locomotive Magazine, Volume XXVIII [28], (15 September 1922), p. 255.See also the Nasmyth Wilson production list at [],%20Gaskell%20and%20Company&nojs=1, last accessed 24 October 2017. (Thanks to David Cormack for his 17 November 2020 email correcting the wheel arrangement for this pair.) Works numbers were 1357-1358 in 1922.

Although most of the BPT motive power stud consisted of the handy little A class Mogul tanks (Locobase 20312), the Port Authority felt the need for something much more powerful for shunting the Wadala gravitation yard. This facility lay about six miles from the Ballard Pier Station in Bombay itself and was the inshore end of a 14-mile (22 km) rail line. It was part of a modern railway built to handle traffic from a port that accounted for half of India's total export traffic. 104 miles of track served the docks' goods traffic. Most of the mileage used 75 lb/yard (37.5 kg/metre) rail. Passenger trains consisted of troop trains and postal trains attended the port's mail steamers.

BPT got this enormous pair, among the largest tank locomotives to operate on the broad gauge. Few designs are more attractive than those that are already paid for and these served well enough.

BPT used the pair until at least 1996.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID20313
RailroadBombay Port Trust
Number in Class2
Road Numbers25-26
Number Built2
BuilderNasmyth Wilson
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.67 / 6
Engine Wheelbase (ft / m)34.67 / 10.57
Ratio of driving wheelbase to overall engine wheelbase 0.57
Overall Wheelbase (engine & tender) (ft / m)34.67 / 10.57
Axle Loading (Maximum Weight per Axle) (lbs / kg)38,976 / 17,679
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)236,600 / 107,320
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)236,600 / 107,320
Tender Water Capacity (gals / ML)2400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)23.5" x 26" / 597x660
Tractive Effort (lbs / kg)43,076 / 19538.97
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)266 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.50 / 4.11
Firebox Area (sq ft / m2)183 / 17
Grate Area (sq ft / m2)32.30 / 3
Evaporative Heating Surface (sq ft / m2)2298 / 213.49
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2298 / 213.49
Evaporative Heating Surface/Cylinder Volume176.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5814
Same as above plus superheater percentage5814
Same as above but substitute firebox area for grate area32,940
Power L13766
Power MT

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