Data from narrowmind.railfan.net, supplemented and corrected by DeGolyer, Vol 78, pp. 225+. Works numbers were 58851 in November 1925; 58852, 58879-58882 in December 1925.
A sextet of passenger Pacifics with good power for the metre gauge. The big grate was needed to burn the low-calorie Brazilian coal and the firebox's heating surface was supplemented by 16 sq ft (1.5 sq m) of arch tubes. Superheated steam was admitted to the cylinders through 8" (203 mm) piston valves.
All would later operate on the Santa Catarina, which was rolled into the Rede Mineira de Viatpo (RMV). At least the 335 continued in tourist service after the end of the Second Millennium.
Data from narrowmind.railfan.net, supplemented and corrected by DeGolyer, Volume78, pp. 225+. Works numbers were 58883-58884 in December 1925.
Note this is a compact, three-cylinder freight engine burning Brazilian coal (hence the low grate demand factor). Six axles (vs the five of a 4-6-0 or 2-8-0) spread the weight out while the three cylinders (fed by small 6"/152 mm piston valves) must have smoothed out the power. In all other respects, the 169 and 170 were identical to the six passenger engines purchased at nearly the same time (see Locobase 15392).
This pair would later operate on the Santa Catarina, which was rolled into the Rede Mineira de Viatpo (RMV). Even after the turn into the Twenty-First century, the 338 could still be found in tourist service on the former Mogyana Railway.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 44, p. 53. Works numbers were 37829-37837 in July 1912.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 66, p. 249. Works numbers were 52410-52413 in September 1919.
The Oeste de Minas returned to Baldwin for more Pacifics seven years after the earlier set was delivered (Locob ase 13254). Like the older engines, these were superheated wood-burners with the same power dimensions and firebox. But the boiler layout was reorganized to accommodate more Type A elements in slightly smaller flues. Some small tubes were inevitably sacrificed to make room.
The result was a greater percentage of heating surface being derived from the superheater.
Principal Dimensions by Steve Llanso of Middle Run Media | ||||
---|---|---|---|---|
Class | 163 | 169 | 80 | 89 |
Locobase ID | 15392 | 15391 | 13254 | 15120 |
Railroad | Oeste de Minas | Oeste de Minas | Oeste de Minas | Oeste de Minas |
Country | Brazil | Brazil | Brazil | Brazil |
Whyte | 4-6-2 | 4-6-2 | 4-6-2 | 4-6-2 |
Number in Class | 6 | 2 | 9 | 4 |
Road Numbers | 163-168 / 331-336 | 169-170 / 337-338 | 80-88 | 89-92 |
Gauge | metre | metre | Metre | Metre |
Number Built | 6 | 2 | 9 | 4 |
Builder | Baldwin | Baldwin | Baldwin | Baldwin |
Year | 1925 | 1925 | 1912 | 1919 |
Valve Gear | Walschaert | Walschaert | Walschaert | Walschaert |
Locomotive Length and Weight | ||||
Driver Wheelbase (ft / m) | 8.83 / 2.69 | 8.83 / 2.69 | 8.50 / 2.59 | 8.50 / 2.59 |
Engine Wheelbase (ft / m) | 24.67 / 7.52 | 24.67 / 7.52 | 24 / 7.32 | 24 / 7.32 |
Ratio of driving wheelbase to overall engine wheelbase | 0.36 | 0.36 | 0.35 | 0.35 |
Overall Wheelbase (engine & tender) (ft / m) | 50.42 / 15.37 | 50.42 / 15.37 | 46.42 / 14.15 | 49.42 / 15.06 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||||
Weight on Drivers (lbs / kg) | 73,000 / 33,112 | 75,600 / 34,292 | 68,000 / 30,844 | 66,000 / 29,937 |
Engine Weight (lbs / kg) | 104,000 / 47,174 | 110,150 / 49,963 | 96,000 / 43,545 | 96,000 / 43,545 |
Tender Loaded Weight (lbs / kg) | 69,000 / 31,298 | 69,000 / 31,298 | 60,000 / 27,216 | 60,000 / 27,216 |
Total Engine and Tender Weight (lbs / kg) | 173,000 / 78,472 | 179,150 / 81,261 | 156,000 / 70,761 | 156,000 / 70,761 |
Tender Water Capacity (gals / ML) | 3000 / 11.36 | 3000 / 11.36 | 3000 / 11.36 | 3000 / 11.36 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6 / 6 | 6 / 6 | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 41 / 20.50 | 42 / 21 | 38 / 19 | 37 / 18.50 |
Geometry Relating to Tractive Effort | ||||
Driver Diameter (in / mm) | 46 / 1168 | 46 / 1168 | 46 / 1168 | 46 / 1168 |
Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 | 180 / 1240 | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 22" / 406x559 | 14" x 20" / 356x508 | 15" x 22" / 381x559 | 15" x 22" / 381x559 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 14.25" x 20" / 362x508 (1) | |||
Tractive Effort (lbs / kg) | 18,733 / 8497.16 | 19,792 / 8977.51 | 16,464 / 7467.95 | 16,464 / 7467.95 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.90 | 3.82 | 4.13 | 4.01 |
Heating Ability | ||||
Tubes (number - dia) (in / mm) | 110 - 2" / 51 | 110 - 2" / 51 | 122 - 2" / 51 | 98 - 2" / 51 |
Flues (number - dia) (in / mm) | 18 - 5.375" / 137 | 18 - 5.375" / 137 | 12 - 5.5" / 140 | 18 - 5.375" / 137 |
Flue/Tube length (ft / m) | 15 / 4.57 | 15 / 4.57 | 15.50 / 4.72 | 15.50 / 4.72 |
Firebox Area (sq ft / m2) | 122 / 11.33 | 122 / 11.33 | 96 / 8.92 | 96 / 8.92 |
Grate Area (sq ft / m2) | 33.40 / 3.10 | 33.40 / 3.10 | 26 / 2.42 | 26 / 2.42 |
Evaporative Heating Surface (sq ft / m2) | 1359 / 126.25 | 1359 / 126.25 | 1346 / 125.05 | 1277 / 118.64 |
Superheating Surface (sq ft / m2) | 282 / 26.20 | 282 / 26.20 | 238 / 22.11 | 334 / 31.03 |
Combined Heating Surface (sq ft / m2) | 1641 / 152.45 | 1641 / 152.45 | 1584 / 147.16 | 1611 / 149.67 |
Evaporative Heating Surface/Cylinder Volume | 265.45 | 381.38 | 299.13 | 283.80 |
Computations Relating to Power Output (More Information) | ||||
Robert LeMassena's Power Computation | 6012 | 6012 | 4680 | 4680 |
Same as above plus superheater percentage | 7034 | 7034 | 5382 | 5663 |
Same as above but substitute firebox area for grate area | 25,693 | 25,693 | 19,872 | 20,909 |
Power L1 | 12,149 | 11,498 | 12,169 | 14,608 |
Power MT | 1100.71 | 1005.90 | 1183.59 | 1463.87 |