Data from narrowmind.railfan.net, supplemented and amended by DeGolyer, Vol 79, pp. 244+. Works number was 60366 in January 1928.
Outside valves and cylinders used a Walschaerts valve gear, straight stack on this small Pacific. The impressive direct heating surface area included 8 sq ft (0.75 sq m) of arch tubes and 19 sq ft (1.75 sq m) in the combustion chamber. Even for this narrow a gauge, the 6" (152 mm) diameter of the piston valves seems small.
Itaqui is in the southeastern part of Brazil, near Paraguay and this railway offered relatively generous curve radii of 80 metres (262 feet) and maximum grades of 2%.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Sao Borja |
| Locobase ID | 4424 |
| Railroad | E. de F. Itaqui-Sao Borja |
| Country | Brazil |
| Whyte | 4-6-2 |
| Number in Class | 1 |
| Road Numbers | 14 |
| Gauge | metre |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1928 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8 / 2.44 |
| Engine Wheelbase (ft / m) | 23.17 / 7.06 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.35 |
| Overall Wheelbase (engine & tender) (ft / m) | 46.52 / 14.18 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 15,428 |
| Weight on Drivers (lbs / kg) | 42,100 / 19,096 |
| Engine Weight (lbs / kg) | 78,900 / 35,788 |
| Tender Loaded Weight (lbs / kg) | 58,000 / 26,308 |
| Total Engine and Tender Weight (lbs / kg) | 136,900 / 62,096 |
| 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) | 23 / 11.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13" x 20" / 330x508 |
| Tractive Effort (lbs / kg) | 11,629 / 5274.83 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.62 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 62 - 2" / 51 |
| Flues (number - dia) (in / mm) | 10 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 12 / 3.66 |
| Firebox Area (sq ft / m2) | 103 / 9.57 |
| Grate Area (sq ft / m2) | 20.20 / 1.88 |
| Evaporative Heating Surface (sq ft / m2) | 658 / 61.13 |
| Superheating Surface (sq ft / m2) | 136 / 12.63 |
| Combined Heating Surface (sq ft / m2) | 794 / 73.76 |
| Evaporative Heating Surface/Cylinder Volume | 214.16 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3434 |
| Same as above plus superheater percentage | 4018 |
| Same as above but substitute firebox area for grate area | 20,487 |
| Power L1 | 9284 |
| Power MT | 1458.51 |