Data from Lionel Wiener, "Les Chemins de Fer de Bresil", Revue General (Janvier 1923), p. 13. Works numbers were 8110-8111 and 8498-8503 in 1912
A photo of this design shows two outsized domes on a straight boiler. For some reason, D R Carling's definitive book on Twelve-wheeled engines doesn't mention this batch.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 30, p. 242 and .Volume 33, p. 30; and Walter Camp, "Recent Baldwin Locomotives for Foreign Shipment", Railway and Engineering Review, Volume XLVII [47], No 39 (28 September 1907), p. 846 See Locobase 13144 for a brief description of the Araraquara. Works numbers were 31064 in June 1907 and 34160 in January 1910.
Dennis Rock Carling's 1972 history of the 4-8-0 arrangement doesn't include this pair of narrow-gauge, wood-burning Twelve-wheelers. The 1907 engine was procured through the Schill Seebohm & Company trading company. Baldwin's specs indicated the demands imposed by the 6's operating environment when they required the 6 to ascend a maximum grade of 2 1/2% while hauling 175 tons, negotiate a curve radius of 120 metres (394 ft or 9 1/2 degrees), and pull 1,450 tons on the level while not overburdening the 38-40-lb/yard (19-20-kg/metre) rail.
The design's cylinders sloped at 1:48 toward the front to clear the four-wheel bogies. Continuously equalized on each side, the driver set included flangeless second and third drivers on each side to aid in negotiating sharp curves. Cast steel frames joined with doubled wrought iron in the front frames. A 16" (406 mm) straight stack rose out of its extended smokebox. (Many narrow-gauge wood-burners used a large cinder-catching stack, but perhaps the Araraquara's operating area didn't include much forest along the tracks.)
To extend the locomotive's range, the tender on the 6 featured a wood rack that stood 3' (914 mm) above the sides and 12" (305 mm) along each side; its rated capacity was two cords.. When Araraquara ordered its twin two years later, however, they changed the spec to eliminate the side boards. (Locobase wonders if they made loading the tender--presumably by hand--more difficult.)
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 21 | 6 |
Locobase ID | 20543 | 13145 |
Railroad | Araraquara | Araraquara |
Country | Brazil | Brazil |
Whyte | 4-8-0 | 4-8-0 |
Number in Class | 2 | |
Road Numbers | 21-26 | 6, 13 |
Gauge | Metre | Metre |
Number Built | 2 | |
Builder | Borsig | Burnham, Williams & Co |
Year | 1912 | 1907 |
Valve Gear | Stephenson | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 11.48 / 3.50 | 11.75 / 3.58 |
Engine Wheelbase (ft / m) | 19.77 / 6.03 | 20.42 / 6.22 |
Ratio of driving wheelbase to overall engine wheelbase | 0.58 | 0.58 |
Overall Wheelbase (engine & tender) (ft / m) | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 59,525 / 27,000 | 66,000 / 29,937 |
Engine Weight (lbs / kg) | 78,264 / 35,500 | 81,000 / 36,741 |
Tender Loaded Weight (lbs / kg) | 66,139 / 30,000 | 50,000 / 22,680 |
Total Engine and Tender Weight (lbs / kg) | 144,403 / 65,500 | 131,000 / 59,421 |
Tender Water Capacity (gals / ML) | 2244 / 8.50 | 2500 / 9.47 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 11.60 / 11 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 25 / 12.50 | 28 / 14 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 38 / 965 | 38 / 965 |
Boiler Pressure (psi / kPa) | 171.10 / 1180 | 160 / 1100 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16.14" x 20.08" / 410x510 | 16" x 20" / 406x508 |
Tractive Effort (lbs / kg) | 20,020 / 9080.93 | 18,324 / 8311.64 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 2.97 | 3.60 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 150 - 2" / 51 | |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 13.54 / 4.13 | |
Firebox Area (sq ft / m2) | 88.30 / 8.21 | |
Grate Area (sq ft / m2) | 19.38 / 1.80 | 15.40 / 1.43 |
Evaporative Heating Surface (sq ft / m2) | 1098 / 102 | 1138 / 105.76 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1098 / 102 | 1138 / 105.76 |
Evaporative Heating Surface/Cylinder Volume | 230.92 | 244.51 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 3316 | 2464 |
Same as above plus superheater percentage | 3316 | 2464 |
Same as above but substitute firebox area for grate area | 14,128 | |
Power L1 | 3439 | |
Power MT | 459.50 |