Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 25, p. 33. Works number was 20968 in October 1902
The broker for this skinny-gauge saddle tank was Valentin Elcoro & Co. for Don Manuel Hernandez Acevedo.
Locobase know little about Hacienda Pardo, but he found a Facebook post that he can't resist posting about a "forgotten bridge" posted 19 July 2026 on the Que Bonito San Luis in Villa de Reyes, SLP [San Luis Potosí] thread ([]):
As Google translated his remarks, note the role Hernancez Acevedo's Hacienda Pardo played in building this railway bridge::
"You likely aren't familiar with this architectural treasure, which sits in silence as the world forgets it.
The La Asunción Bridge is a masterpiece by Antonio Prieto, completed in 1904; until 1920, it served as a crucial link in the [27 mile; 43.5 km] Villa de Reyes railway line between Jesús María and Ojo Caliente. Built using cement, masonry, and compressed bricks from the Hacienda de Pardo, it boasts impressive dimensions: a 70-meter embankment, a height of 13 meters, and a width of 1.80 meters.
Seems likely that this tiny engine crossed this bridge from time to time.
He added: "We combined a motorcycle ride with hiking to visit the site and took the opportunity to explore the area further-staying out until nightfall. Along the way, we encountered a chapel, other ruined buildings, and a wide variety of wildlife-mostly venomous species. Yet, the sad reality we cannot ignore is that this living testament to the engineers and artisans who tamed the desert is dying in silence, left in perpetual solitude"
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 12622 |
| Railroad | Hacienda Pardo |
| Country | Mexico |
| Whyte | 0-4-2ST |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | 60 cm |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1902 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 3.67 / 1.12 |
| Engine Wheelbase (ft / m) | 8.50 / 2.59 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.43 |
| Overall Wheelbase (engine & tender) (ft / m) | 8.50 / 2.59 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 10,500 / 4763 |
| Engine Weight (lbs / kg) | 15,500 / 7031 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 150 / 0.57 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 9 / 4.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 24 / 610 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 7" x 12" / 178x305 |
| Tractive Effort (lbs / kg) | 3124 / 1417.02 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.36 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 46 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 6.26 / 1.91 |
| Firebox Area (sq ft / m2) | 19.50 / 1.81 |
| Grate Area (sq ft / m2) | 4.53 / 0.42 |
| Evaporative Heating Surface (sq ft / m2) | 132 / 12.27 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 132 / 12.27 |
| Evaporative Heating Surface/Cylinder Volume | 249.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 680 |
| Same as above plus superheater percentage | 680 |
| Same as above but substitute firebox area for grate area | 2925 |
| Power L1 | 2598 |
| Power MT | 1090.97 |