Sorocabana 2-10-2 Locomotives in Brazil
Class Details by Steve Llanso of Sweat House Media
Class 901 (Locobase 2495)
Data from H M Le Fleming, "Illustrated Survey of Modern Steam Locomotives" in Patrick Ransome-Wallis (ed.), Concise Encyclopedia of World Railway Locomotives (London: Hutchinson & Company, 1959), Plate 93, p. 364 and 383. Additional information from a Rory O'Connor post dated 18 June 2000 to [
], last accessed 26 March 2012. (Thanks to Teemu Koivumaki whose 2023 email included a comprehensive spreadsheet of Brazilian steam locomotive builders, works numbers, and owners.) 901 builder Berliner Maschinenbau (BMAG) works number was 9586 in 1929. 902 builder Henschel & Sohn works number was 21577 in 1929.
BMAG's 901 drove the outside cylinders with Walschaert gear and the Gresley/Holcroft link to drive the inside. Henschel''s 902 had three Walschaert constant-lead radial gear sets, the inside cylinder valve actuated through a rocker arm driven by the radius rod.
A 4-10-2 was identical except for the leading truck, but was built later.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 901 |
| Locobase ID | 2495 |
| Railroad | Sorocabana |
| Country | Brazil |
| Whyte | 2-10-2 |
| Number in Class | 2 |
| Road Numbers | 901-902 |
| Gauge | Metre |
| Number Built | 2 |
| Builder | several |
| Year | 1930 |
| Valve Gear | Walschaert & Gresley |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 19.03 / 5.80 |
| Engine Wheelbase (ft / m) | 38.55 / 11.75 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 35,164 / 15,950 |
| Weight on Drivers (lbs / kg) | 187,338 / 84,975 |
| Engine Weight (lbs / kg) | 206,077 / 93,475 |
| Tender Loaded Weight (lbs / kg) | 94,523 / 42,875 |
| Total Engine and Tender Weight (lbs / kg) | 300,600 / 136,350 |
| Tender Water Capacity (gals / ML) | 4488 / 17 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7.80 / 7 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 62 / 31 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1220 |
| Boiler Pressure (psi / kPa) | 203.10 / 1400 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.87" x 24.02" / 530x610 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 20.87" x 22.01" / 530x559 (1) |
| Tractive Effort (lbs / kg) | 54,867 / 24887.28 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.41 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 53.28 / 4.95 |
| Evaporative Heating Surface (sq ft / m2) | 3165 / 294 |
| Superheating Surface (sq ft / m2) | 1016 / 94.40 |
| Combined Heating Surface (sq ft / m2) | 4181 / 388.40 |
| Evaporative Heating Surface/Cylinder Volume | 332.80 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,821 |
| Same as above plus superheater percentage | 13,418 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |