Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University,Volume78, pp. 252+. Works numbers were 59310-59314 in July 1926.
During a brief period in the mid-to-late 1920s, both Alco and Baldwin offered three-cylinder engines for all sizes of gauge. This quintet of bi-fuel (Cardiff coal or wood) passenger Mountains were among the biggest of their wheel arrangement to be built for the metre gauge. They operated on 65 lb/yard (32.5 kg/metre) rail up 2 1/2% grades that included 13.4 degree curves (radii of 130 metres ).
For all their size, their fireboxes seem small and indeed the design contains an imbalance between the size of the boiler and the cylinder volume and a relatively small firebox and a low factor of adhesion. The nearly square cylinders were supplied superheater steam through three 10" (254 mm) piston valves. Usually, these engines burned coal, but they were to accept "readily" a change to wood fuel.
Their green paint was very precisely formulated: 7,200 grams (15.87 lb) of canary yellow, 1,200 grams (2.65 lb) of ivory black (an oddly self-contradictory designation), and 200 grams (7.05 ounces) of chinese vermillion. The first coat was to be "very dry", the second "brilliant" and covered by two coats of varnish.
Data from , p. 978. Works numbers were 66979-66983 in August 1926, 67400-67409 in May 1927.
A year and a half after Baldwin delivered five metre-gauge Mountains to the Sorocabana (Locobase 15395), Alco's Schenectady supplied fifteen more of approximately the same design. As the specs show, however, the Alcos used three smaller-diameter pistons and varied the stroke lengths depending on whether the cylinders were outside (24") or inside (22"). Calculated tractive effort remained about the same as the smaller drivers (48" vs 54") compensated for the smaller piston area in the cylinders.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 801 | 806 |
Locobase ID | 15395 | 20972 |
Railroad | Sorocabana | Sorocabana |
Country | Brazil | Brazil |
Whyte | 4-8-2 | 4-8-2 |
Number in Class | 5 | 15 |
Road Numbers | 801-805 | 806-820 |
Gauge | Metre | Metre |
Number Built | 5 | 15 |
Builder | Baldwin | Alco-Schenectady |
Year | 1926 | 1924 |
Valve Gear | Walschaert | Baker |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 15 / 4.57 | |
Engine Wheelbase (ft / m) | 34.17 / 10.42 | |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 | |
Overall Wheelbase (engine & tender) (ft / m) | 60.54 / 18.45 | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 35,265 / 15,996 | |
Weight on Drivers (lbs / kg) | 141,000 / 63,957 | 137,500 / 62,369 |
Engine Weight (lbs / kg) | 207,000 / 93,894 | 199,000 / 90,265 |
Tender Loaded Weight (lbs / kg) | 81,000 / 36,741 | |
Total Engine and Tender Weight (lbs / kg) | 288,000 / 130,635 | |
Tender Water Capacity (gals / ML) | 3700 / 14.02 | |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8 / 7 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 | 57 / 28.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 54 / 1372 | 48 / 1219 |
Boiler Pressure (psi / kPa) | 202 / 1390 | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 22" / 508x559 (3) | 18.5" x 24" / 470x610 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 22" / 470x559 (1) | |
Tractive Effort (lbs / kg) | 41,971 / 19037.75 | 42,424 / 19243.23 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.36 | 3.24 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 157 - 2.25" / 57 | |
Flues (number - dia) (in / mm) | 34 - 5.5" / 140 | |
Flue/Tube length (ft / m) | 20.75 / 6.32 | |
Firebox Area (sq ft / m2) | 165 / 15.33 | 173 / 16.07 |
Grate Area (sq ft / m2) | 52.20 / 4.85 | 49.20 / 4.57 |
Evaporative Heating Surface (sq ft / m2) | 3088 / 286.88 | 3179 / 295.34 |
Superheating Surface (sq ft / m2) | 863 / 80.17 | 856 / 79.52 |
Combined Heating Surface (sq ft / m2) | 3951 / 367.05 | 4035 / 374.86 |
Evaporative Heating Surface/Cylinder Volume | 257.35 | 425.75 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 10,544 | 9840 |
Same as above plus superheater percentage | 12,864 | 11,906 |
Same as above but substitute firebox area for grate area | 40,663 | 41,866 |
Power L1 | 17,696 | 17,262 |
Power MT | 1106.75 | 1107.09 |