Data from DeGolyer, Volume 72, pp. 375+; and "New Baldwin Locomotives for India", Locomotive Magazine, Volume XXX [30] (15 August 1924), p. 240.. Works numbers were 57738-57739 in April 1924.
LM's report gave as the reason for ordering thiis Pacific pair as "to thoroughly test the claims of modern American build for their service ...Two similar locomotives of British build will be put into running about the same time, so that accurate results in service can be ascertained." 900 was named "New York"; one can only hope 901 bore the name "Philadelphia".
Piston valves measured 10" (254 mm) in diameter and firebox heating surface included 17 sq ft (1.60sq m) of arch tubes. "Nearly all of the construction details are to the manufacturer's own pattern, only those fittings or appliances of British make being introduced which are essential for the engines working in the others of the railway mentioned."
Reclassified HP in 1957 when the M&SM was folded into the Indian State Railway.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 900 "New York" HP |
| Locobase ID | 15293 |
| Railroad | Madras & Southern Mahratta |
| Country | India |
| Whyte | 4-6-2 |
| Number in Class | 2 |
| Road Numbers | 900-901/37001-37002 |
| Gauge | 5'6" |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1924 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.83 / 3.91 |
| Engine Wheelbase (ft / m) | 33.75 / 10.29 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 62.75 / 19.13 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 36,000 / 16,329 |
| Weight on Drivers (lbs / kg) | 116,000 / 52,617 |
| Engine Weight (lbs / kg) | 192,000 / 87,090 |
| Tender Loaded Weight (lbs / kg) | 142,980 / 64,855 |
| Total Engine and Tender Weight (lbs / kg) | 334,980 / 151,945 |
| Tender Water Capacity (gals / ML) | 6600 / 25 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 11 / 10 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 64 / 32 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 74 / 1880 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 28,020 / 12709.67 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.14 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 114 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 24 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 20.50 / 6.25 |
| Firebox Area (sq ft / m2) | 168 / 15.61 |
| Grate Area (sq ft / m2) | 48 / 4.46 |
| Evaporative Heating Surface (sq ft / m2) | 2245 / 208.57 |
| Superheating Surface (sq ft / m2) | 612 / 56.86 |
| Combined Heating Surface (sq ft / m2) | 2857 / 265.43 |
| Evaporative Heating Surface/Cylinder Volume | 182.24 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8640 |
| Same as above plus superheater percentage | 10,454 |
| Same as above but substitute firebox area for grate area | 36,590 |
| Power L1 | 15,485 |
| Power MT | 882.89 |