Huanchaco de Bolivia 2-4-2 Locomotives in Bolivia

Class Details by Steve Llanso of Sweat House Media

Class M Concha y Toro (Locobase 10794)

Data from Railroad & Engineering Journal, Volume LXI [61] (Volume 1, new series), (July 1887), pp. 301-303. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 13, p. 114. Works numbers were 8215 in October 1886 and 10942-10944 in June 1890.

The REJ (of which Matthew Forney was now editor) explained that this locomotive used outside frames to improve the locomotive's stability at speeds of 35-40 mph (56-64 kph). He noted that the the distance from center to center of frames measured 43, which allowed the firebox to sit between the frames with almost the same width as a standard-gauge frame.

Forney added that each auxiliary truck was equalized with its adjacent driving axle and the front truck used side bearings to "prevent its riding on the equalizing fulcrums as on a knive edge." And the springs afforded "a lateral, flexible base almost as great as that of a standard-gauge locomotive." In sum, he said: "The rsult of this construction is that the engine is perfectly steady laterally."

At the time of sale, the railway was already identified as the Antofagasta & Bolivia, of which the Huanchaco was an element. It was also know as the Aguas Blancas Railway and later the A&B.

Interesting four-year gap between the first of these four-coupleds and the other three; all were ordered on 30 June 1886. When produced in 1890, the trio were named Olaneta, Tomas Frias, and Santa Cruz.

In 1905, the Antofagasta & Bolivia was taken into the FerroCarril Bolivia (Bolivian State Railways).

Principal Dimensions by Steve Llanso of Middle Run Media

ClassM Concha y Toro
Locobase ID10794
RailroadHuanchaco de Bolivia
Number in Class1
Road Numbers20/33
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.67 / 1.73
Engine Wheelbase (ft / m)20.75 / 6.32
Ratio of driving wheelbase to overall engine wheelbase 0.27
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)36,190 / 16,416
Engine Weight (lbs / kg)51,880 / 23,532
Tender Loaded Weight (lbs / kg)40,000 / 18,144
Total Engine and Tender Weight (lbs / kg)91,880 / 41,676
Tender Water Capacity (gals / ML)2400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)30 / 15
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)13" x 20" / 330x508
Tractive Effort (lbs / kg)7781 / 3529.41
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.65
Heating Ability
Tubes (number - dia) (in / mm)109 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.50 / 3.20
Firebox Area (sq ft / m2)69 / 6.41
Grate Area (sq ft / m2)11 / 1.02
Evaporative Heating Surface (sq ft / m2)663 / 61.62
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)663 / 61.62
Evaporative Heating Surface/Cylinder Volume215.78
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1430
Same as above plus superheater percentage1430
Same as above but substitute firebox area for grate area8970
Power L13412
Power MT415.70

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