Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 17, p.30 (and firebox comparison with Locobase 13015, Kosaka Copper Mine, firebox dimensions at DeGolyer, Volume 29, p.198. (Thanks to Thomas Miller's 1 February 2018 email providing the Baldwin builder's number. It led to the creation of this new entry.) Works number was 11889 in May 1891.
This tank joined the VdeM as it completed construction of its first 22 km (13.6 miles).
NB: Locobase estimates the firebox heating surface by comparing the dimensions in the Baldwin spec for this locomotive and essentially identical specs for the Kosaka Copper Mine's saddle tank of 1906. Although the two locomotives do not share many similarities, their dimensions were the same to within 1/4". Moreover, the length to width ratio for both fireboxes was oddly wide to exactly the same extent.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 16343 |
| Railroad | Valle de Mexico |
| Country | Mexico |
| Whyte | 2-4-4T |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | 3' |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1891 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5 / 1.52 |
| Engine Wheelbase (ft / m) | 21.83 / 6.65 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.23 |
| Overall Wheelbase (engine & tender) (ft / m) | 21.83 / 6.65 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 32,000 / 14,515 |
| Engine Weight (lbs / kg) | 52,000 / 23,587 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 500 / 1.89 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 27 / 13.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 37 / 940 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 |
| Tractive Effort (lbs / kg) | 7939 / 3601.07 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.03 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 106 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9 / 2.74 |
| Firebox Area (sq ft / m2) | 42 / 3.90 |
| Grate Area (sq ft / m2) | 8.20 / 0.76 |
| Evaporative Heating Surface (sq ft / m2) | 479 / 44.50 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 479 / 44.50 |
| Evaporative Heating Surface/Cylinder Volume | 229.19 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1230 |
| Same as above plus superheater percentage | 1230 |
| Same as above but substitute firebox area for grate area | 6300 |
| Power L1 | 3049 |
| Power MT | 420.12 |
