Cerro de Pasco 2-8-2 Locomotives in Peru


Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 13084)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 30, p 185. Works numbers 30078, 30125 in February 1907 and 32270-32271 in November.

Martin Coombs noted that at least the 10 arrived with slide valves and inside link motion. When the C de P fitted the class with piston valves, they also replaced the Stephenson gear with outside Walschaert's constant-lead gear.


Class 40 (Locobase 13085)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p 217. See Locobase 13083 for a brief description of this high-altitude line. Works numbers were 39122-39123 in January 1913.

More frankly drag-freight engines than the four Mikados shown in Locobase 12084, this pair served the coal mine branch that ended at Quishuarcancha. A note in the specs says that "Hereafter apply Walschaert valve gear". It's not clear if these two were retrofitted.

Principal Dimensions by Steve Llanso of Sweat House Media

Class1040
Locobase ID13084 13085
RailroadCerro de PascoCerro de Pasco
CountryPeruPeru
Whyte2-8-22-8-2
Number in Class42
Road Numbers10-12, 1440-41
GaugeStdStd
Number Built42
BuilderBurnham, Williams & CoBaldwin
Year19071913
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.2712 / 3.66
Engine Wheelbase (ft / m)28.83 / 8.7925.83 / 7.87
Ratio of driving wheelbase to overall engine wheelbase 0.49 0.46
Overall Wheelbase (engine & tender) (ft / m)55.67 / 16.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)122,000 / 55,338125,000 / 56,699
Engine Weight (lbs / kg)156,000 / 70,760158,000 / 71,668
Tender Loaded Weight (lbs / kg)100,000 / 45,359100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)256,000 / 116,119258,000 / 117,027
Tender Water Capacity (gals / ML)5000 / 18.945000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1010 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.5052 / 26
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 132142 / 1067
Boiler Pressure (psi / kPa)180 / 12.40200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x66021" x 22" / 533x559
Tractive Effort (lbs / kg)30,600 / 13879.9439,270 / 17812.59
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99 3.18
Heating Ability
Tubes (number - dia) (in / mm)192 - 2.25" / 57300 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)17.67 / 5.3914.50 / 4.42
Firebox Area (sq ft / m2)139 / 12.92
Grate Area (sq ft / m2)36.80 / 3.4238.50 / 3.58
Evaporative Heating Surface (sq ft / m2)2403 / 223.33
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2403 / 223.33
Evaporative Heating Surface/Cylinder Volume272.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation66247700
Same as above plus superheater percentage66247700
Same as above but substitute firebox area for grate area27,800
Power L14918
Power MT346.95

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