Antofagasta 4-8-2 Locomotives in Chile


Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 14478)

Data from "Antofagasta (Chili) And Bolivia Railway, Metre Gauge, Sixteen 4-8-2 Type Locomotives," Vulcan Foundry Company Magazines, Vol 3, No. 3 (Autumn 1954), pp. 16-18. Works numbers were 6166-6181 in 1954.

Oil-burning and fitted with Belpaire fireboxes, this class of Mountains were designed to negotiate curves with radii as small as 75 metres (246 feet). Ten of the engines went to the Bolivian section, six to the Chilean section.

NB: Tube length is an estimate based on the calculated tube and flue heating surface areas and a further calculation using the known counts and diameters of the two sizes of flues.

Principal Dimensions by Steve Llanso of Sweat House Media

Classunknown
Locobase ID14478
RailroadAntofagasta (Chile ) & Bolivia (FCAB)
CountryChile
Whyte4-8-2
Number in Class16
Road Numbers
GaugeMetre
Number Built16
BuilderVulcan Foundry
Year1954
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)33,600 / 15,241
Weight on Drivers (lbs / kg)133,560 / 60,582
Engine Weight (lbs / kg)197,344 / 89,514
Tender Loaded Weight (lbs / kg)130,032 / 58,982
Total Engine and Tender Weight (lbs / kg)327,376 / 148,496
Tender Water Capacity (gals / ML)7200 / 27.27
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)2160.50 / 8178
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)33,242 / 15078.34
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.02
Heating Ability
Tubes (number - dia) (in / mm)130 - 2.25" / 57
Flues (number - dia) (in / mm)28 - 5.5" / 140
Flue/Tube length (ft / m)16.50 / 5.03
Firebox Area (sq ft / m2)180 / 16.73
Grate Area (sq ft / m2)39 / 3.62
Evaporative Heating Surface (sq ft / m2)2110 / 196.10
Superheating Surface (sq ft / m2)457 / 42.47
Combined Heating Surface (sq ft / m2)2567 / 238.57
Evaporative Heating Surface/Cylinder Volume247.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7800
Same as above plus superheater percentage9204
Same as above but substitute firebox area for grate area42,480
Power L113,358
Power MT881.98

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