Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p. 8. p. See also George Woodman Hilton, American Narrow-Gauge Railroads (Stanford, Calif: Stanford University Press, 1990), p. 312. Works numbers were 19126-19127 in June 1901.
Representing a direct reorder of the 1899 Michoacan Consolidations described in Locobase 11903, this pair was produced soon after the third engine of the earlier class. Instead of Mexico as a destination, however, the 4 and 5 went to very similar terrain in Arizona Territory. The MS operated a short line of 18 miles that served Phelps Dodge's Detroit Copper Mining Company holding northwest of Clifton. According to Hilton, "The route was a very difficult one with a rise of 1,400 feet in 18.4 miles." Its twisting path earned it the nationally known nickname "The Corkscrew Route of America."
The MS operated through World War I as a common carrier (it even had a coach-parlor car for the tourist trade) and even went to the trouble of eliminating three of the loops in its route in 1914 in favor of switchbacks.
After the road was abandoned in May 1922, the 4 was sold south in 1925 to Mexico's Yeso de Tigre (Tiger Chalk). The Y de T was nationalized in 1941 and the NdeM renumbered it 455. Connelly doesn't record what happened to the 5.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 12503 |
| Railroad | Morenci Southern |
| Country | USA |
| Whyte | 2-8-0 |
| Number in Class | 2 |
| Road Numbers | 4-5 |
| Gauge | 3' |
| Number Built | 2 |
| Builder | Burnham, Williams & Co |
| Year | 1901 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.92 / 3.02 |
| Engine Wheelbase (ft / m) | 17.08 / 5.21 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.58 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 83,000 / 37,648 |
| Engine Weight (lbs / kg) | 90,000 / 40,823 |
| Tender Loaded Weight (lbs / kg) | 54,000 / 24,494 |
| Total Engine and Tender Weight (lbs / kg) | 144,000 / 65,317 |
| Tender Water Capacity (gals / ML) | 3500 / 13.26 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 36 / 914 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 18" / 432x457 |
| Tractive Effort (lbs / kg) | 19,652 / 8914.01 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.22 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 136 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.33 / 4.37 |
| Firebox Area (sq ft / m2) | 73.47 / 6.83 |
| Grate Area (sq ft / m2) | 16.50 / 1.53 |
| Evaporative Heating Surface (sq ft / m2) | 1215 / 112.92 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1215 / 112.92 |
| Evaporative Heating Surface/Cylinder Volume | 256.87 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2640 |
| Same as above plus superheater percentage | 2640 |
| Same as above but substitute firebox area for grate area | 11,755 |
| Power L1 | 3212 |
| Power MT | 341.26 |