Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 44, p. 56; and Baldwin Locomotive Works Negative 4056, Class 12-28-1/4-E, 2 supplied in March 2023 in an email from Teemu Koivumaki. Works numbers were 38155-38163 in August 1912.
Relatively unusual Mikados in that they were superheated wood burners (2 1/2 cords in the tender), these were big engines for the gauge. (Also somewhat unusual was the decrease at delivery from Baldwin's estimated weights on drivers and the engine as a whole. Usually the estimates seem to have undershot.)
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 100 |
| Locobase ID | 13253 |
| Railroad | Oeste de Minas |
| Country | Brazil |
| Whyte | 2-8-2 |
| Number in Class | 9 |
| Road Numbers | 100-108 |
| Gauge | Metre |
| Number Built | 9 |
| Builder | Baldwin |
| Year | 1911 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11 / 3.35 |
| Engine Wheelbase (ft / m) | 24.17 / 7.37 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.46 |
| Overall Wheelbase (engine & tender) (ft / m) | 50.29 / 15.33 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 85,300 / 38,691 |
| Engine Weight (lbs / kg) | 114,300 / 51,846 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 174,300 / 79,062 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 36 / 18 |
| 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) | 17" x 22" / 432x559 |
| Tractive Effort (lbs / kg) | 21,875 / 9922.34 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.90 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 150 - 2" / 51 |
| Flues (number - dia) (in / mm) | 20 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 15.50 / 4.72 |
| Firebox Area (sq ft / m2) | 116 / 10.78 |
| Grate Area (sq ft / m2) | 29.20 / 2.71 |
| Evaporative Heating Surface (sq ft / m2) | 1770 / 164.44 |
| Superheating Surface (sq ft / m2) | 384 / 35.67 |
| Combined Heating Surface (sq ft / m2) | 2154 / 200.11 |
| Evaporative Heating Surface/Cylinder Volume | 306.25 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4964 |
| Same as above plus superheater percentage | 5858 |
| Same as above but substitute firebox area for grate area | 23,270 |
| Power L1 | 11,954 |
| Power MT | 1235.83 |