Usina Junqueira 2-6-2 Locomotives in Brazil
Class Details by Steve Llanso of Sweat House Media
Class Maria Theodora (Locobase 15449)
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 79, pp. 282+. See also "E F Junqueira" archived at [
] . Works number was 60070 in June 1927.
Even now preserved for display and adorned with its copper-top stack, this plantation Prairie tank served this sugar mill for decades. The mill was located in the northern part of Sao Paulo State, some 450 km (280 miles) from the capital. The railway measured only 3.858 km (2.4 miles).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Maria Theodora |
| Locobase ID | 15449 |
| Railroad | Usina Junqueira |
| Country | Brazil |
| Whyte | 2-6-2T |
| Number in Class | 1 |
| Road Numbers | 5 |
| Gauge | Metre |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9 / 2.74 |
| Engine Wheelbase (ft / m) | 21.33 / 6.50 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.42 |
| Overall Wheelbase (engine & tender) (ft / m) | 21.33 / 6.50 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 55,000 / 24,948 |
| Engine Weight (lbs / kg) | 77,000 / 34,927 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 77,000 / 34,927 |
| Tender Water Capacity (gals / ML) | 900 / 3.41 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 31 / 15.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 40 / 1016 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14" x 18" / 356x457 |
| Tractive Effort (lbs / kg) | 12,745 / 5781.04 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.32 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 140 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.50 / 2.59 |
| Firebox Area (sq ft / m2) | 66 / 6.13 |
| Grate Area (sq ft / m2) | 11.60 / 1.08 |
| Evaporative Heating Surface (sq ft / m2) | 606 / 56.30 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 606 / 56.30 |
| Evaporative Heating Surface/Cylinder Volume | 188.96 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1972 |
| Same as above plus superheater percentage | 1972 |
| Same as above but substitute firebox area for grate area | 11,220 |
| Power L1 | 3308 |
| Power MT | 397.79 |