Zarraga & Company 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class Adela 4 (Locobase 12646)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 25, p. 132. Works numbers were 21308 in November 1902, 29764 in December 1906 and and 32813 in June 1908.

Grades of 4% and 75-ft radius curves were common challenges for metre-gauge Consolidations like these Adelas.

Specifications by Steve Llanso of Sweat House Media
ClassAdela 4
Locobase ID12,646
RailroadZarraga & Company
CountryUSA
Whyte2-8-0
Number in Class2
Road Numbers4-6
Gauge3'
Number Built2
BuilderBurnham, Williams & Co
Year1902
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 9.83
Engine Wheelbase (ft)17.17
Ratio of driving wheelbase to overall engine wheebase 0.57
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)68,000
Engine Weight (lbs)77,000
Tender Loaded Weight (lbs)37,000
Total Engine and Tender Weight (lbs)114,000
Tender Water Capacity (gals)1500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)28
Geometry Relating to Tractive Effort
Driver Diameter (in)36
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)14.5" x 20"
Tractive Effort (lbs)15,886
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.28
Heating Ability
Firebox Area (sq ft)56.20
Grate Area (sq ft)11.59
Evaporative Heating Surface (sq ft)978
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)978
Evaporative Heating Surface/Cylinder Volume255.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1854
Same as above plus superheater percentage1854
Same as above but substitute firebox area for grate area8992
Power L13162
Power MT410.06


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