Data from "4-4-0 Tank Locomotives, Madras & Southern Mahratta Railway", Locomotive Magazine, Vol XVI (15 June 1910), p. 128.
Bagnall turned out this pair of Eight-wheeler tanks following the specifications of Messrs/ Rendel & Robertson, the railway's consulting engineers. The LM report says that they were expressly built for fast branch-line services in which speeds could reach 35 mph (56.4 km/h). As befitted a British-built locomotive for the colonies, the firebox was copper and the tubes were brass.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 204 |
| Locobase ID | 16042 |
| Railroad | Madras & Southern Mahratta |
| Country | India |
| Whyte | 4-4-0T |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | Metre |
| Number Built | 2 |
| Builder | WG Bagnall |
| Year | 1910 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5.50 / 1.68 |
| Engine Wheelbase (ft / m) | 14.75 / 4.50 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 14.75 / 4.50 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 19,040 / 8636 |
| Weight on Drivers (lbs / kg) | 39,360 / 17,853 |
| Engine Weight (lbs / kg) | 57,680 / 26,163 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 57,680 / 26,163 |
| Tender Water Capacity (gals / ML) | 720 / 2.73 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.70 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 33 / 16.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42.50 / 1080 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 18" / 279x457 |
| Tractive Effort (lbs / kg) | 7841 / 3556.62 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 129 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 6.58 / 2.01 |
| Firebox Area (sq ft / m2) | 50 / 4.65 |
| Grate Area (sq ft / m2) | 7.50 / 0.70 |
| Evaporative Heating Surface (sq ft / m2) | 440 / 40.88 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 440 / 40.88 |
| Evaporative Heating Surface/Cylinder Volume | 222.24 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1350 |
| Same as above plus superheater percentage | 1350 |
| Same as above but substitute firebox area for grate area | 9000 |
| Power L1 | 4444 |
| Power MT | 497.83 |