Data from "'Pacific' Type Express Engine for the Sao Paolo Railway of Brazil," Locomotive Magazine, Volume 18 (15 February 1912), p. 29; J F Gairns, "Remarkable Locomotives of 1911", Cassier's Magazine, Volume XLI [41], No 5 (May 1912), pp. 414-416; and Lionel Wiener, "The Railways of Brazil,, VII Railways in the State of Sao Paulo", Cassier's Magazine, Volume XXXIX [39], No.1 (November 1909). p. 61.(Thanks to Teemu Koivumaki whose 2023 email included a comprehensive spreadsheet of Brazilian steam locomotive builders, works numbers, and owners.) Works numbers were 19499-19503 in 1911.
Locobase considers this engine as not a handsome design. The perfectly vertical slab sides of the Belpaire firebox and the large cab, together with the small drivers added up to a graceless profile. JF Gairns would have disagreed with Locobase, describing the design as "particularly neat in many ways, and attention is paid to appearance to the extent of providing a polished brass dome, with bright bands and mouldings round the barrel of the boiler, in addition to neatness of boiler."
But the engines were powerful express types, designed to the specifications of consulting engineer D M Fox at the instruction of locomotive superintendent C R Hillman. Indeed, JF Gairns in his year-in-review article, contended that they "may be said to represent the highest development at present in South American in British hands."' As their service didn't included "very fast work", Garins noted, their 54" driver diameters were relatively small, which meant they combined, he added, "reasonable speediness" with "good load-hauling capacity. Coal consumption averaged 47.8 lb/mile (13.64 kg/km), according to Lionel Wiener.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 92 |
| Locobase ID | 20070 |
| Railroad | Sao Paulo |
| Country | Brazil |
| Whyte | 4-6-2 |
| Number in Class | 6 |
| Road Numbers | 92-96 |
| Gauge | 5'3" |
| Number Built | 6 |
| Builder | North British |
| Year | 1911 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.01 / 3.66 |
| Engine Wheelbase (ft / m) | 29.17 / 8.89 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.41 |
| Overall Wheelbase (engine & tender) (ft / m) | 49.74 / 15.16 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 116,845 / 53,000 |
| Engine Weight (lbs / kg) | 180,228 / 81,750 |
| Tender Loaded Weight (lbs / kg) | 84,558 / 38,355 |
| Total Engine and Tender Weight (lbs / kg) | 264,786 / 120,105 |
| Tender Water Capacity (gals / ML) | 4198 / 15.90 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 65 / 32.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 200.20 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21.5" x 25.98" / 546x660 |
| Tractive Effort (lbs / kg) | 30,964 / 14045.05 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.77 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 164.69 / 15.30 |
| Grate Area (sq ft / m2) | 28.52 / 2.65 |
| Evaporative Heating Surface (sq ft / m2) | 1600 / 148.64 |
| Superheating Surface (sq ft / m2) | 430 / 39.95 |
| Combined Heating Surface (sq ft / m2) | 2030 / 188.59 |
| Evaporative Heating Surface/Cylinder Volume | 146.56 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5710 |
| Same as above plus superheater percentage | 6909 |
| Same as above but substitute firebox area for grate area | 39,895 |
| Power L1 | 12,696 |
| Power MT | 718.64 |