Data from "Locomotives for the Brazilian Centennial Exhibition", Railway Age, Volume 74, No 8 (24 February 1923), pp. 467-468. Works numbers were 59126-59128 in March 1917, 62555-62556 in January 1921, 63464 in November 1922, and 65532-65533 in April 1924.
Alco's Pittsburgh Works produced the first three wood-burning Pacifics, which went to what was then the longest narrow-gauge private railway in South America. The design, which featured a relatively small grate but rather large piston valves (10" or 254 mm), was produced by Alco's Paterson, NJ subsidiary Cooke Locomotive Works for the Sorocbana in 1918 (Locobase ). Cooke then produced more of the same design for the Mogyana in the early 1920s.
It's likely as well that two more engines--268-269--repeated the same design in June 1926, but by then Cooke had been closed and Alco's remaining works at Schenectady finished the class.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 260 |
| Locobase ID | 20500 |
| Railroad | Mogiana |
| Country | Brazil |
| Whyte | 4-6-2 |
| Number in Class | 8 |
| Road Numbers | 260-267 |
| Gauge | Metre |
| Number Built | 8 |
| Builder | Alco - multiple works |
| Year | 1917 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.50 / 2.90 |
| Engine Wheelbase (ft / m) | 25.83 / 7.87 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 49 / 14.94 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 71,000 / 32,205 |
| Engine Weight (lbs / kg) | 113,000 / 51,256 |
| Tender Loaded Weight (lbs / kg) | 68,600 / 31,116 |
| Total Engine and Tender Weight (lbs / kg) | 181,600 / 82,372 |
| Tender Water Capacity (gals / ML) | 2600 / 9.85 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 20" / 445x508 |
| Tractive Effort (lbs / kg) | 19,668 / 8921.27 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.61 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 103 - 2.008" / 51 |
| Flues (number - dia) (in / mm) | 16 - 5.394" / 137 |
| Flue/Tube length (ft / m) | 16 / 4.88 |
| Firebox Area (sq ft / m2) | 94 / 8.73 |
| Grate Area (sq ft / m2) | 29.40 / 2.73 |
| Evaporative Heating Surface (sq ft / m2) | 1309 / 121.61 |
| Superheating Surface (sq ft / m2) | 308 / 28.61 |
| Combined Heating Surface (sq ft / m2) | 1617 / 150.22 |
| Evaporative Heating Surface/Cylinder Volume | 235.10 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4998 |
| Same as above plus superheater percentage | 5948 |
| Same as above but substitute firebox area for grate area | 19,016 |
| Power L1 | 10,422 |
| Power MT | 970.84 |