Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p. 61. Works number was 38097 in August 1912.
Each of the driving axles under this Ten-wheeler was required to weigh no more than 7 long tons (15,680 lb or 7,112 kg).
The B a M was chartered in 1878 and 1879 in Minas Gerais and Bahia, respectively, to bring freight to the port of Caravellas in Bahia. The line headed west out of Caravellas as far as the Aimores mountains before entering Minas Gerais on its way to Teofilo Otoni on 36-lb/yard (18-kg/metre) rail.
The 145-mile (234-km) route was later described as "inefficient", but attracted private investment in the early 'teens by a consortium who hoped for development of hydroelectrive power in an area also favored with rich timber lands.
Later the 21 went to the Federaux l'est Bresilien, which sold it as the #6 to the Usina Catende Pernambuco, one of the largest sugar processors in the state and well known for its political influence.
More than 30 years later, the B a M was sold to the Brazilian government.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 21 |
| Locobase ID | 13961 |
| Railroad | Bahia a Minas |
| Country | Brazil |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 21 |
| Gauge | Metre |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1912 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.50 / 2.90 |
| Engine Wheelbase (ft / m) | 17.67 / 5.39 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 39.71 / 12.10 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 43,000 / 19,504 |
| Engine Weight (lbs / kg) | 55,800 / 25,310 |
| Tender Loaded Weight (lbs / kg) | 48,000 / 21,772 |
| Total Engine and Tender Weight (lbs / kg) | 103,800 / 47,082 |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 24 / 12 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13" x 18" / 330x457 |
| Tractive Effort (lbs / kg) | 9850 / 4467.89 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 125 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.83 / 3 |
| Firebox Area (sq ft / m2) | 63.60 / 5.91 |
| Grate Area (sq ft / m2) | 11.20 / 1.04 |
| Evaporative Heating Surface (sq ft / m2) | 619 / 57.51 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 619 / 57.51 |
| Evaporative Heating Surface/Cylinder Volume | 223.85 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1792 |
| Same as above plus superheater percentage | 1792 |
| Same as above but substitute firebox area for grate area | 10,176 |
| Power L1 | 3795 |
| Power MT | 583.71 |