Data from "Tank Locomotive for Suburban Traffic, Great Indian Peninsula Railway", Locomotive Magazine, Volume XX [20], No 267 (15 November 1914). (Many thanks to Abhijit Gore for his 30 December 2020 email supplying the class ID, road numbers, and corrected set of works numbers.) Works numbers were 2991-3002 in 1914.
Except for the wider track of the wheels needed for the 9 1/2" (241 mm) wider gauge, the set of tank engines that arrived on the GIPR in 1914 would have looked at home on any British railway. A low-set cab, long tanks, Belpaire firebox all bear witness to their roots. The outside Walschaerts valve gear acuated piston valves.
The class hauled suburban trains in the Mumbai (formerly Bombay) area.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | P1 |
| Locobase ID | 20322 |
| Railroad | Great Indian Peninsula (GIPR) |
| Country | India |
| Whyte | 2-6-2T |
| Number in Class | 12 |
| Road Numbers | 648-659 |
| Gauge | 5'6" |
| Number Built | 12 |
| Builder | Vulcan Foundry |
| Year | 1914 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14 / 4.27 |
| Engine Wheelbase (ft / m) | 31 / 9.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
| Overall Wheelbase (engine & tender) (ft / m) | 31 / 9.45 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 134,400 / 60,963 |
| Engine Weight (lbs / kg) | 192,640 / 87,380 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 192,640 / 87,380 |
| Tender Water Capacity (gals / ML) | 2640 / 10 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 75 / 37.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 26" / 533x660 |
| Tractive Effort (lbs / kg) | 23,627 / 10717.04 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.69 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 156 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 21 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 11.25 / 3.43 |
| Firebox Area (sq ft / m2) | 144 / 13.38 |
| Grate Area (sq ft / m2) | 27 / 2.51 |
| Evaporative Heating Surface (sq ft / m2) | 1276 / 118.54 |
| Superheating Surface (sq ft / m2) | 261 / 24.25 |
| Combined Heating Surface (sq ft / m2) | 1537 / 142.79 |
| Evaporative Heating Surface/Cylinder Volume | 122.42 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4320 |
| Same as above plus superheater percentage | 5054 |
| Same as above but substitute firebox area for grate area | 26,957 |
| Power L1 | 7337 |
| Power MT | 361.06 |