Sorocabana 4-10-2 Locomotives in Brazil
Class Details by Steve Llanso of Sweat House Media
Class 1001 (Locobase 4421)
Data from Bruce Pryor, Locomotives, 4-10-2 on the Narrow Gauge Pictures From Off The Beaten Path at [
], last accessed 3 April 2023; Alco-Schenectady builder's card for Order No. S-1742 for Class 4102 S 235 "Three Cylinder" supplied by Alexander Blessing in his 2 April 2023 email (Locobase thanks Alex for the information.). Works numbers were 67996-68000 in July 1929, 68694-68697 in April 1935
Only a few dozen 4-10-2 three-cylinder locomotives entered service on United States railroads. Alco did enjoy some ezport success that included these metre-gauge engines. There were at least two batches of 4-10-2s built for the Sorocabana, this design and the later one found under Locobase 975.
The data imply a well-balanced design that featured a high percentage of superheater area, sizable grate burning "Cardiff coal" and firebox heating surface areas. Its factor of adhesion suggests good traction as well.
Class 1015 (Locobase 975)
Data from 1947 Locomotive Cyclopedia. Works numbers were 69137-69140 in March 1939, 69250-69253 in February 1940
Stroke was actually 22" for the inside cylinder, 24" for the two outside cylinders. This design appears to be an elaboration of Henschel's Mikado of 1930, but with an additional leading truck axle.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 1001 | 1015 |
| Locobase ID | 4421 | 975 |
| Railroad | Sorocabana | Sorocabana |
| Country | Brazil | Brazil |
| Whyte | 4-10-2 | 4-10-2 |
| Number in Class | 9 | 8 |
| Road Numbers | 1001-1009 | 1015-1022 |
| Gauge | metre | metre |
| Number Built | 9 | 8 |
| Builder | Alco-Schenectady | Alco-Schenectady |
| Year | 1929 | 1940 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 19.08 / 5.82 | 19.08 / 5.82 |
| Engine Wheelbase (ft / m) | 37.75 / 11.51 | 38.58 / 11.76 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 63.87 / 19.47 | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 178,000 / 80,740 | 187,340 / 84,976 |
| Engine Weight (lbs / kg) | 234,500 / 106,368 | 250,000 / 113,398 |
| Tender Loaded Weight (lbs / kg) | 93,000 / 42,184 | 245,000 / 111,130 |
| Total Engine and Tender Weight (lbs / kg) | 327,500 / 148,552 | 495,000 / 224,528 |
| Tender Water Capacity (gals / ML) | 4500 / 17.05 | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7 / 6.40 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 | 62 / 31 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 48 / 1219 | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 210 / 1450 | 239.30 / 1650 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 24" / 470x610 (1) | 17.5" x 24" / 445x610 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 22" / 470x559 | 17.5" x 22" / 445x559 (1) |
| Tractive Effort (lbs / kg) | 43,273 / 19628.33 | 45,421 / 20602.64 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.11 | 4.12 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 210 - 2" / 51 | |
| Flues (number - dia) (in / mm) | 38 - 5.375" / 137 | |
| Flue/Tube length (ft / m) | 18.50 / 5.64 | |
| Firebox Area (sq ft / m2) | 253 / 23.50 | |
| Grate Area (sq ft / m2) | 55.50 / 5.16 | 65.30 / 6.07 |
| Evaporative Heating Surface (sq ft / m2) | 3261 / 302.96 | 3346 / 310.97 |
| Superheating Surface (sq ft / m2) | 857 / 79.62 | 851 / 79.09 |
| Combined Heating Surface (sq ft / m2) | 4118 / 382.58 | 4197 / 390.06 |
| Evaporative Heating Surface/Cylinder Volume | 873.47 | 500.80 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 11,655 | 15,626 |
| Same as above plus superheater percentage | 14,103 | 18,752 |
| Same as above but substitute firebox area for grate area | 64,287 | |
| Power L1 | 19,438 | |
| Power MT | 1203.75 | |