Larkhana-Jacobabad 2-6-2 Locomotives in India
Class Details by Steve Llanso of Sweat House Media
Class 1 (Locobase 20893)
Data from "Narrow-Gauge Locomotives, Larkhana Jacobabad Ry of India", Locomotive Magazine, Volume XXVIII [28] (15 August 1922), p. 221. See also "Larkana-Jacobabad Light Railway" in Wikipedia at [
], last accessed 20 May 2021; and "
Pakistan Railway on the West Bank of Indus" on the All Things Pakistan website, 19 November 2009, last accessed 20 May 2021.
Impressive pocket rocket with sizable boiler, big firebox and grate, relatively high superheat ratio in a package with a nearly ideal factor of adhesion. That's what the numbers said, at any rate, and LM agreed that these engines were "powerful and up-to-date tender engines."
Part of the North West Indian railway system in what became Pakistan in 1947, this light railway ran from Larkana Junction to Jacobabad Junction, which lay 85 miles (136 km) away. A survey of Pakistani railways posted in November 2009 provided addtional details: "Larkana ... is the largest city in Western Sindh and a Railway junction too. A track from Larkana branches off towards west and reached Jacobabad Junction via Silra Shahdadkot. This branch track follows the protective embankment (bund) of Sindh Right Bank."
The railway was converted by the Pakistani Railways to 5' 6" (1,676 mm) broad gauge in 1956.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 20893 |
| Railroad | Larkhana-Jacobabad |
| Country | India |
| Whyte | 2-6-2T |
| Number in Class | 3 |
| Road Numbers | 1-3 |
| Gauge | 2'6" |
| Number Built | 3 |
| Builder | WG Bagnall |
| Year | 1922 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7 / 2.13 |
| Engine Wheelbase (ft / m) | 20 / 6.10 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.35 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 40,320 / 18,289 |
| Engine Weight (lbs / kg) | 61,600 / 27,941 |
| Tender Loaded Weight (lbs / kg) | 33,600 / 15,241 |
| Total Engine and Tender Weight (lbs / kg) | 95,200 / 43,182 |
| Tender Water Capacity (gals / ML) | 1560 / 5.91 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.50 / 2.30 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 22 / 11 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 36 / 914 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13" x 16" / 330x406 |
| Tractive Effort (lbs / kg) | 10,215 / 4633.45 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.95 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 76 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 10 - 5.19" / 132 |
| Flue/Tube length (ft / m) | 10.50 / 3.20 |
| Firebox Area (sq ft / m2) | 62 / 5.76 |
| Grate Area (sq ft / m2) | 14 / 1.30 |
| Evaporative Heating Surface (sq ft / m2) | 568 / 52.77 |
| Superheating Surface (sq ft / m2) | 124 / 11.52 |
| Combined Heating Surface (sq ft / m2) | 692 / 64.29 |
| Evaporative Heating Surface/Cylinder Volume | 231.08 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2240 |
| Same as above plus superheater percentage | 2643 |
| Same as above but substitute firebox area for grate area | 11,706 |
| Power L1 | 7788 |
| Power MT | 1277.50 |