Morenci Southern 2-8-0 "Consolidation" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 12503)

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 Sweat House Media
Locobase ID12503
RailroadMorenci Southern
Number in Class2
Road Numbers4-5
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
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 wheebase 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 / ML/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 / 11
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
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 Volume256.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2640
Same as above plus superheater percentage2640
Same as above but substitute firebox area for grate area11,755
Power L13212
Power MT341.26

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