Data from Lionel Wiener, "Locomotives of the Rio Grande do Sul", Volume 19 (14 June 1913), p. 150-151. (Thanks to Teemu Koivumaki whose 2023 email included a comprehensive spreadsheet of Brazilian steam locomotive builders, works numbers, and owners.) Works numbers were 6277-6278 in April 1907, 6296-6297 in June, 6599-6604 in August.
Wiener reported that this decade of Eight-wheelers was part of a 67-locomotive order from Borsig in 1906. The German builder was known for the quality of its boiler design and all of the engines in the order were, said Wiener, "fitted with the same boilers, differing only in length." He added, "It is chiefly to the excellence of this boiler and its firebox that these engines owe their success and their fuel economy." Moreover, the higher pitch of the boiler (2.15 m above the rail) "makes the engine ride easily, renders the mechanism more accessible, and gives greater freedom in designing the firebox."
Four of the 4-4-0s arrived in 1907, the other six joining them in 1908. The large cab had front windows nearly down to the running board. The smokebox and saddle were shrouded in plates in a European style while the large pilot most resembled the "cowcatchers" of 19th century American locomotives.
NB: see Locobase 13987 for an overview of the RG do Sul as described by Lionel Wiener in 1912.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 81 |
| Locobase ID | 20225 |
| Railroad | Compagnie Auxiliare/Rio Grande do Sul |
| Country | Brazil |
| Whyte | 4-4-0 |
| Number in Class | 10 |
| Road Numbers | 81-90 |
| Gauge | Metre |
| Number Built | 10 |
| Builder | Borsig |
| Year | 1907 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 18.54 / 5.65 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 3419 / 12.95 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49.25 / 1251 |
| Boiler Pressure (psi / kPa) | 171 / 1180 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13" x 19.69" / 330x500 |
| Tractive Effort (lbs / kg) | 9821 / 4454.74 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 171 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.63 / 2.63 |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 12.38 / 1.15 |
| Evaporative Heating Surface (sq ft / m2) | |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | |
| Evaporative Heating Surface/Cylinder Volume | |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2117 |
| Same as above plus superheater percentage | 2117 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |