Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 25, p. 239. Works number was 21824 in March 1903.
Mikados even twice this size were rarely found among 2-8-2s so the Juana is a true outlier--apparently the smallest ever built for North American service. The Hacienda de Hornos ranched cattle and grew grain. The two-ft-(610 mm) gauge railway that served this expansive plantation covered 51 km (32 miles) and opened for common-carrier passenger and freight service in 1904.
When the railroad encountered the Mexican Revolution, it came off second-best. By 1930, the Hornos had stopped issuing timetables.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Juana |
| Locobase ID | 12667 |
| Railroad | FC de Hornos |
| Country | Mexico |
| Whyte | 2-8-2 |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | 60 cm |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1903 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.92 / 2.41 |
| Engine Wheelbase (ft / m) | 18.83 / 5.74 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.42 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 7000 / 3175 |
| Weight on Drivers (lbs / kg) | 28,000 / 12,701 |
| Engine Weight (lbs / kg) | 40,000 / 18,144 |
| Tender Loaded Weight (lbs / kg) | 29,000 / 13,154 |
| Total Engine and Tender Weight (lbs / kg) | 69,000 / 31,298 |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 12 / 6 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 28 / 711 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10" x 14" / 254x356 |
| Tractive Effort (lbs / kg) | 6375 / 2891.65 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.39 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 53 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.79 / 3.29 |
| Firebox Area (sq ft / m2) | 39.60 / 3.68 |
| Grate Area (sq ft / m2) | 8.34 / 0.77 |
| Evaporative Heating Surface (sq ft / m2) | 336 / 31.22 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 336 / 31.22 |
| Evaporative Heating Surface/Cylinder Volume | 264.57 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1251 |
| Same as above plus superheater percentage | 1251 |
| Same as above but substitute firebox area for grate area | 5940 |
| Power L1 | 2943 |
| Power MT | 926.89 |