Ambalema-IbaguT 4-8-0 Locomotives in Colombia


Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 15429)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 79, pp. 108 See also Jorge Arias de Greiff, Un Momento Estelar de la Ingeniera Mecanica en Colombia: Los Disenos de Locomotoras de PC Dewhurst", Boletin Cultural y Bibliographico, Volumne XXVI, No. 21, 1989, pp.19-29. Works number was 60950 in August 1929.

See Locobase 15367 for a full discussion of PC Dewhurst's thoughts in designing the famed "Docerruedas" (Twelve-wheelers). This small railway joined the host of other Colombian railways in buying the particularly apt design, but couldn't resist tinkering with the boiler, deleting three of the tubes found in other Colombian 4-8-0s and substituting an additional flue for the superheater.

When the Ambalema-IbaguT was nationalized in 1953, the 3 was renumbered 73.

Principal Dimensions by Steve Llanso of Sweat House Media

Class3
Locobase ID15429
RailroadAmbalema-IbaguT
CountryColombia
Whyte4-8-0
Number in Class1
Road Numbers3 / 73
Gauge3'
Number Built1
BuilderBaldwin
Year1929
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.81
Engine Wheelbase (ft / m)21.92 / 6.68
Ratio of driving wheelbase to overall engine wheelbase 0.57
Overall Wheelbase (engine & tender) (ft / m)47.40 / 14.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)103,000 / 46,720
Engine Weight (lbs / kg)128,000 / 58,060
Tender Loaded Weight (lbs / kg)72,000 / 32,659
Total Engine and Tender Weight (lbs / kg)200,000 / 90,719
Tender Water Capacity (gals / ML)3300 / 12.50
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)6 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 22" / 457x559
Tractive Effort (lbs / kg)27,265 / 12367.21
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.78
Heating Ability
Tubes (number - dia) (in / mm)126 - 2" / 51
Flues (number - dia) (in / mm)21 - 5.375" / 137
Flue/Tube length (ft / m)13.83 / 4.22
Firebox Area (sq ft / m2)106 / 9.85
Grate Area (sq ft / m2)32.60 / 3.03
Evaporative Heating Surface (sq ft / m2)1422 / 132.11
Superheating Surface (sq ft / m2)318 / 29.54
Combined Heating Surface (sq ft / m2)1740 / 161.65
Evaporative Heating Surface/Cylinder Volume219.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5868
Same as above plus superheater percentage6924
Same as above but substitute firebox area for grate area22,514
Power L18915
Power MT763.27

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