Huanchaca de Bolivia 2-8-0 Locomotives in Chile


Class Details by Steve Llanso of Sweat House Media

Class Polapi (Locobase 12521)

Data from Baldwin Locomotive Works Specification for Engines digitized by the DeGolyer Library of Southern Methodist University Vol 24, pp. 236-237. Works numbers were 19437-19440 in August 1901.

Polapi, Adelante, Exito, and Reserva were the names of this next quartet of Moguls sold to the H de B. They followed the slightly larger 2-6-0s shown in Locobase 11568 and continued the trend toward wholesome nouns for names. (Well, Polapi was a volcano, but Adelante, Exito, and Reserva translate as Forward!, Success!, and ...uh ...Reserve!).

This small Consolidation design had a long boiler for its wheelbase, the tubes measuring 4 feet longer than the adhesion spread. More of the design would follow in 1906, but would weigh about 2 tons less; see Locobase 12594.


Class Vulcano (Locobase 12150)

Data from Baldwin Locomotive Works Specification for Engines digitized by the DeGolyer Library of Southern Methodist University, Volume 19, pp. 236-237. Works numbers were 14461-14465 in September 1895, 17461-17462 in February 1900, 18388-18391 in November.

As delivered, the 1895 Consolidations were named Vulcano, Venus, Apalo, Minerva, and Jupiter. Later batches followed from Baldwin in 1900-1901. The two in February 1900 had local names: Oraro, Francisco Argandona. Names for the November and August 1901 batches were more hortatory: Victoria, Union, Fuerza, Trabajo. Four more slightly smaller engines were delivered in 1901; see Locobase 12521.

The Huanchaca joined the Antofagasta (Chile ) & Bolivia (FCAB) in 1908, at which point the class was renumbered. 93-94, 43-44, 95, 99-108

Principal Dimensions by Steve Llanso of Sweat House Media

ClassPolapiVulcano
Locobase ID12521 12150
RailroadHuanchaca de BoliviaHuanchaca de Bolivia
CountryChileChile
Whyte2-8-02-8-0
Number in Class411
Road Numbers71-74 / 105-10859-65, 67-70
Gauge2'6"2'6"
Number Built411
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19011895
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.58 / 3.22 9.83 / 3
Engine Wheelbase (ft / m)18 / 5.4918 / 5.49
Ratio of driving wheelbase to overall engine wheelbase 0.59 0.55
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)76,000 / 34,47375,000
Engine Weight (lbs / kg)89,000 / 40,37089,000
Tender Loaded Weight (lbs / kg)53,000 / 24,04047,500 / 21,546
Total Engine and Tender Weight (lbs / kg)142,000 / 64,410136,500 / 21,546
Tender Water Capacity (gals / ML)2400 / 9.092400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)32 / 1631 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37.50 / 95337.50 / 953
Boiler Pressure (psi / kPa)160 / 11150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x50815" x 20" / 381x508
Tractive Effort (lbs / kg)16,320 / 7402.6415,300 / 6939.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.66 4.90
Heating Ability
Tubes (number - dia) (in / mm)123 - 2.25" / 57126 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.59 / 4.4514.58 / 4.44
Firebox Area (sq ft / m2)76 / 7.0676.40 / 7.10
Grate Area (sq ft / m2)13 / 1.2113.70 / 1.27
Evaporative Heating Surface (sq ft / m2)1125 / 104.551148 / 106.69
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1125 / 104.551148 / 106.69
Evaporative Heating Surface/Cylinder Volume275.02280.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation20802055
Same as above plus superheater percentage20802055
Same as above but substitute firebox area for grate area12,16011,460
Power L136793507
Power MT426.88412.35

All material Copyright © SteamLocomotive.com
Wes Barris