International Railway of Central America 4-6-0 Locomotives in Guatemala

Class Details by Steve Llanso of Sweat House Media

Class 27 (Locobase 14194)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 36, p. 256; Volume 49, p. 118. Works numbers were 35273-35274 in September 1910, 38792-38794 in November 1912.

Bought by United Fruit as the latest in a long series of 4-6-0s of very similar specifications (see earlier, lighter engines at Locobase 12117), the principal difference between these locomotives and the earlier Ten-wheelers was the adoption of oil firing, a three-ton increase in weight and the use of outside radial Walschaert gear in 27-28/84-85. (The last three reverted to inside Stephenson link motion.). The combustion chamber contributed 23.4 sq ft to the direct heating surface area.

Like the others, these engines were rated for "heavy, 3 1/2%" grades and 15-degree curves, so the flues were to be "sloped to be covered with water on grades."

27-28 were renumbered 84-85 in 1913, apparently to make way for the similar 27-29

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14194
RailroadInternational Railway of Central America
Number in Class5
Road Numbers27-28, 27-29/ 84-85, 56-58
Number Built5
Valve Gearvarious
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.42 / 2.26
Engine Wheelbase (ft / m)16.75 / 5.11
Ratio of driving wheelbase to overall engine wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)44.62 / 13.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)78,700 / 35,698
Engine Weight (lbs / kg)95,300 / 43,227
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)155,300 / 70,443
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1350 / 5110
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
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)17" x 20" / 432x508
Tractive Effort (lbs / kg)22,109 / 10028.49
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56
Heating Ability
Tubes (number - dia) (in / mm)200 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.33 / 4.06
Firebox Area (sq ft / m2)106.40 / 9.89
Grate Area (sq ft / m2)16.10 / 1.50
Evaporative Heating Surface (sq ft / m2)1492 / 138.66
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1492 / 138.66
Evaporative Heating Surface/Cylinder Volume283.97
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2898
Same as above plus superheater percentage2898
Same as above but substitute firebox area for grate area19,152
Power L14623
Power MT388.51

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