Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 26, p. 142. Works number was 23735 in February 1904.
One can only suppose that this was the prestige locomotive for the FCUdeY in the early years of the 20th Century. It was the only Atlantic.A delivery detail notes that the original stack used a straight, thin pipe with a half-round conical top. A note in the specs advises that future engines should use the Radley & Hunter cabbage stack.
Painting instructions depict a black locomotive with silver stripes edged with maroon. Likewise, silver letters and numbers were edged in maroon.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Union |
| Locobase ID | 11538 |
| Railroad | Unidos de Yucatan |
| Country | Mexico |
| Whyte | 4-4-2 |
| Number in Class | 1 |
| Road Numbers | 16 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1904 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6 / 1.83 |
| Engine Wheelbase (ft / m) | 23 / 7.01 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.26 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 62,000 / 28,123 |
| Engine Weight (lbs / kg) | 120,000 / 54,431 |
| Tender Loaded Weight (lbs / kg) | 80,000 / 36,287 |
| Total Engine and Tender Weight (lbs / kg) | 200,000 / 90,718 |
| Tender Water Capacity (gals / ML) | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 68 / 1727 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 17,496 / 7936.06 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.54 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 244 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.62 / 4.46 |
| Firebox Area (sq ft / m2) | 134 / 12.45 |
| Grate Area (sq ft / m2) | 24.80 / 2.30 |
| Evaporative Heating Surface (sq ft / m2) | 1982 / 184.20 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1982 / 184.20 |
| Evaporative Heating Surface/Cylinder Volume | 280.34 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4464 |
| Same as above plus superheater percentage | 4464 |
| Same as above but substitute firebox area for grate area | 24,120 |
| Power L1 | 7652 |
| Power MT | 544.19 |