Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 27, p 24. See also Percy Falcke Martin, Mexico of the twentieth century, Volume 1 (London: Edward Arnold, 1907), pp. 291-292. Works number was 24252 in May 1904.
Was this the first Pacific to operate in Mexico? Locobase isn't sure, but it was an early one. Its presence on the C & Z undoubtedly meant to serve the Mazapil mines that lay along the 78-mile line between Saltillo and Concepcion del Oro.
Martin reports that William Purcell's venture into railway building cost a total of 120,000 pounds to complete: "Compared with some other railway construction in Mexico," Martin comments," this moderate price probably constitutes a record, especially recollecting the rough and difficult country passed through. Branches have been thrown out to the camps of San Pedro de Ocampo and Bonanza, the whole cost of their construction being defrayed out of revenue, the line having been a pronounced success from the commencement of its career. The State Government contributed +15,000 towards the cost of construction."
By 1910, the C y Z converted the 6 to a Ten-wheeler and operated for more than 4 additional decades before selling it into museum service in 1965 on the Early West Railways. In 2009, the engine was on display in Keizer, Oregon.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 6 |
| Locobase ID | 12705 |
| Railroad | Coahuila y Zacatecas |
| Country | Mexico |
| Whyte | 4-6-2 |
| Number in Class | 1 |
| Road Numbers | 6 |
| Gauge | 3' |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1904 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.67 / 2.34 |
| Engine Wheelbase (ft / m) | 16.42 / 5 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.47 |
| Overall Wheelbase (engine & tender) (ft / m) | 47.50 / 14.48 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 78,000 / 35,380 |
| Engine Weight (lbs / kg) | 94,000 / 42,638 |
| Tender Loaded Weight (lbs / kg) | 75,000 / 34,019 |
| Total Engine and Tender Weight (lbs / kg) | 169,000 / 76,657 |
| 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) | 43 / 21.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 20" / 432x508 |
| Tractive Effort (lbs / kg) | 21,056 / 9550.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.70 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 191 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.50 / 4.42 |
| Firebox Area (sq ft / m2) | 75.50 / 7.02 |
| Grate Area (sq ft / m2) | 22.60 / 2.10 |
| Evaporative Heating Surface (sq ft / m2) | 1517 / 140.99 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1517 / 140.99 |
| Evaporative Heating Surface/Cylinder Volume | 288.95 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4068 |
| Same as above plus superheater percentage | 4068 |
| Same as above but substitute firebox area for grate area | 13,590 |
| Power L1 | 4547 |
| Power MT | 385.55 |