Colombian National Rwy 2-8-8-2 Locomotives in Colombia

Class Details by Steve Llanso of Sweat House Media

Class 57 (Locobase 2499)

See also Robert Tufnell, The Illustrated Encyclopedia of Railway Locomotives (London: Quarto Publishing Ltd, 1986). (Thanks to Philip Bushdiecker for his 6 January 2021 for correcting a valve gear error.)

Articulated engines of the Kitson-Meyer type resemble Fairlies, but have only one firebox and boiler; the firebox is between the engine sets. This particular type had long water tanks flanking the boiler and very small drivers for substantial tractive effort. So small were the drivers, in fact, that prominent counterbalances had to be carried on the outside for clearance reasons. Tonnage rating was 330 tons at 9-10 mph up a 4.5% grade between Giradot and Bogota. Tufnell notes also that the line ascended in a ruling grade of 4% to reach 9,088 ft from sea level in 82.5 miles. And the curves had radii as low as 260 ft.

They were quite successful and ran until 1959.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2499
RailroadColombian National Rwy
Number in Class
Road Numbers57
Number Built
BuilderRobert Stephenson & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.20 / 3.11
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)53.92 / 16.43
Axle Loading (Maximum Weight per Axle) (lbs / kg)32,480 / 14,733
Weight on Drivers (lbs / kg)259,840 / 117,862
Engine Weight (lbs / kg)291,760 / 132,340
Tender Loaded Weight (lbs / kg)70,500 / 31,978
Total Engine and Tender Weight (lbs / kg)362,260 / 164,318
Tender Water Capacity (gals / ML)4760 / 18.03
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1300 / 4921
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37.50 / 953
Boiler Pressure (psi / kPa)208.90 / 14.40
High Pressure Cylinders (dia x stroke) (in / mm)17.75" x 20" / 451x508 (4)
Tractive Effort (lbs / kg)59,674 / 27067.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.35
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)51 / 4.74
Evaporative Heating Surface (sq ft / m2)2567 / 238.57
Superheating Surface (sq ft / m2)640 / 59.48
Combined Heating Surface (sq ft / m2)3207 / 298.05
Evaporative Heating Surface/Cylinder Volume224.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,654
Same as above plus superheater percentage12,785
Same as above but substitute firebox area for grate area
Power L1
Power MT

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