Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 40, p. 133. Works numbers were 39120-39121 in January 1913.
Before too long, this pair of metre-gauge wood-burning Mallets were sold to the Central do Brasil where they joined the 300, a superheated variant shown in Locobase 13973. Once the 303 arrived in 1919, the four locomotives were for years the most powerful freight engines on the C do B's metric-gauge lines.
Rendered redundant by the introduction of faster superheated steam in 1925, the class were reassigned to other segments that required pulling power more than speed. They operated well into the 1950s.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | A |
| Locobase ID | 13457 |
| Railroad | Vittoria a Minas (CVM) |
| Country | Brazil |
| Whyte | 2-6-6-2 |
| Number in Class | 2 |
| Road Numbers | A-B / 302, 301/1302, 1301 |
| Gauge | Metre |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1913 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 22.17 / 6.76 |
| Engine Wheelbase (ft / m) | 34.50 / 10.52 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.64 |
| Overall Wheelbase (engine & tender) (ft / m) | 57.81 / 17.62 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 110,000 / 49,895 |
| Engine Weight (lbs / kg) | 130,000 / 58,967 |
| Tender Loaded Weight (lbs / kg) | 90,000 / 40,823 |
| Total Engine and Tender Weight (lbs / kg) | 220,000 / 99,790 |
| Tender Water Capacity (gals / ML) | 4500 / 17.05 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 31 / 15.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 41 / 1041 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14.5" x 20" / 368x508 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 22" x 20" / 559x508 |
| Tractive Effort (lbs / kg) | 24,310 / 11026.84 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.52 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 150 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 16.50 / 5.03 |
| Firebox Area (sq ft / m2) | 102 / 9.48 |
| Grate Area (sq ft / m2) | 25.60 / 2.38 |
| Evaporative Heating Surface (sq ft / m2) | 1391 / 129.23 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1391 / 129.23 |
| Evaporative Heating Surface/Cylinder Volume | 363.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5120 |
| Same as above plus superheater percentage | 5120 |
| Same as above but substitute firebox area for grate area | 20,400 |
| Power L1 | 2953 |
| Power MT | 355.10 |