The UV & P served copper mines in the Jerome, Arizona region that owned the reputation in 1914 of being one of the best copper mines in the world. Dutton (p. 58) reports that the 28-mile line between Jerome and the Santa Fe at Prescott had the reputation for being the crookedest line in the world and that "[p]eople joked that passengers in a rear car could look across curves and talk to the engineer." The railroad also brought out silver and gold.
To open the line, the railway bought these two Vauclain compounds. They had two 8" piston valves and were required to traverse curves of 100-ft (30-m) radius (40-45 degrees of curvature) and scale grades of up to 3%
2 had a short career before being wrecked in 1897. 1 remained on the line until it was closed in 1920.
The first two locomotives purchased for the UV & P were the Vaulclain-compound Moguls described in Locobase 12110. More than a year later, the next Mogul arrived as a simple-expansion engine with more and longer tubes of the same large diameter. A diagram shows the desired weight by axle. Front to back the specification read 10,000 lb; 21,000 lb; 24,000 lb; and 23,000 lb.
Alas, the 3 had a short career on the UV & P before she was wrecked in March 1905.
This sextet (and possibly #4 --- works 15536 of October 1897) were slight revisions of the #3 shown in Locobase 12181. The 2 and 3 were replacements for two wrecked predecessors.
The builder retain the same number of tubes but shortened them by 6", which also cut down the wheelbase by a foot, and increased driver diameter by 2". A possible reason for the bobtailing may have lain in the curve restriction set out in the specification - curves could bend at 40-45 degrees of curvature and grades could pitch to 3%. The taller drivers may have been prompted by the operation of mixed trains that needed go a bit quicker perhaps.
All three apparently served the UV & P until it was abandoned in 1920. 8 was sold to Central Lumber Company in February 1923.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||United Verde & Pacific||United Verde & Pacific||United Verde & Pacific|
|Number in Class||2||1||6|
|Road Numbers||1-2||3||5-8, 2-3|
|Builder||Burnham, Williams & Co||Burnham, Williams & Co||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||9||9||8|
|Engine Wheelbase (ft)||15.58||16.33||16.33|
|Ratio of driving wheelbase to overall engine wheebase||0.58||0.55||0.49|
|Overall Wheelbase (engine & tender) (ft)||15.58||41.17||41.17|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||70,000||70,000|
|Engine Weight (lbs)||80,000||79,400|
|Tender Loaded Weight (lbs)||76,000|
|Total Engine and Tender Weight (lbs)||155,400|
|Tender Water Capacity (gals)||2000||3000||3800|
|Tender Fuel Capacity (oil/coal) (gals/tons)||1200|
|Minimum weight of rail (calculated) (lb/yd)||39||39|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||41||41||43|
|Boiler Pressure (psi)||180||160||160|
|High Pressure Cylinders (dia x stroke) (in)||10" x 20"||17" x 20"||17" x 20"|
|Low Pressure Cylinders (dia x stroke) (in)||17" x 20"|
|Tractive Effort (lbs)||11,090||19,173||18,281|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.65||3.83|
|Firebox Area (sq ft)||59||77.90||85|
|Grate Area (sq ft)||15.20||16.75||16.75|
|Evaporative Heating Surface (sq ft)||933||1086||1056|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||933||1086||1056|
|Evaporative Heating Surface/Cylinder Volume||513.19||206.69||200.98|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2736||2680||2680|
|Same as above plus superheater percentage||2736||2680||2680|
|Same as above but substitute firebox area for grate area||10,620||12,464||13,600|