Data from "Buenos Ayres and Pacific Type 2-6-2T", Locomotives Constructed by Kitson & Co. Limited (Leeds, UK: n.d).Works numbers were 4625-4639 in 1909.
High boiler pressure and small drivers gave this Prairie tank design significant power. But the very low factor of adhesion suggests that the actual boiler setting and cutoff combined to deliver a good deal less.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 911 |
| Locobase ID | 21002 |
| Railroad | Buenos Aires Pacific (BAP) |
| Country | Argentina |
| Whyte | 2-6-2T |
| Number in Class | |
| Road Numbers | 911-925 |
| Gauge | 5'6" |
| Number Built | |
| Builder | Kitson |
| Year | 1909 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 26.50 / 8.08 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
| Overall Wheelbase (engine & tender) (ft / m) | 37.67 / 11.48 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 100,800 / 45,722 |
| Engine Weight (lbs / kg) | 158,816 / 72,038 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 158,816 / 72,038 |
| 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) | 56 / 28 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1549 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 24" / 445x610 (3) |
| Tractive Effort (lbs / kg) | 31,238 / 14169.34 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.23 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 109 / 10.13 |
| Grate Area (sq ft / m2) | 22.50 / 2.09 |
| Evaporative Heating Surface (sq ft / m2) | 1393 / 129.41 |
| Superheating Surface (sq ft / m2) | / 26.48 |
| Combined Heating Surface (sq ft / m2) | 1393 / 155.89 |
| Evaporative Heating Surface/Cylinder Volume | 138.99 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4050 |
| Same as above plus superheater percentage | 4050 |
| Same as above but substitute firebox area for grate area | 19,620 |
| Power L1 | 3133 |
| Power MT | 205.57 |