Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 26, p. 266. Works numbers 16432-16433 in December 1898 and 23905, 23967 in March 1904, and 29276 in October 1906.
All of this design sold to this railroad were lettered for the Monte Alto y Tlalnepantla, only the 5th engine is unambiguously numbered.. Locobase cannot determine what road numbers might actually have been borne by which of the first 4 locomotives.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 11494 |
| Railroad | San Ildefonso |
| Country | Mexico |
| Whyte | 2-4-4T |
| Number in Class | 5 |
| Road Numbers | 1-2 and 1-2, 3 |
| Gauge | 3' |
| Number Built | 5 |
| Builder | Burnham, Williams & Co |
| Year | 1898 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6 / 1.83 |
| Engine Wheelbase (ft / m) | 25.67 / 7.82 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.23 |
| Overall Wheelbase (engine & tender) (ft / m) | 25.67 / 7.82 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 45,000 / 20,412 |
| Engine Weight (lbs / kg) | 71,000 / 32,205 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 800 / 3.03 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 38 / 19 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 40 / 1016 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14" x 20" / 356x508 |
| Tractive Effort (lbs / kg) | 12,495 / 5667.64 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.60 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 118 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.04 / 3.06 |
| Firebox Area (sq ft / m2) | 75 / 6.97 |
| Grate Area (sq ft / m2) | 9.50 / 0.88 |
| Evaporative Heating Surface (sq ft / m2) | 688 / 63.94 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 688 / 63.94 |
| Evaporative Heating Surface/Cylinder Volume | 193.26 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1425 |
| Same as above plus superheater percentage | 1425 |
| Same as above but substitute firebox area for grate area | 11,250 |
| Power L1 | 2986 |
| Power MT | 292.58 |