Harriman Lines 4-4-2 "Atlantic" Type Locomotives

Class Atlantic A-105 (Locobase 5340)

Data from table in June 1906 AERJ and article earlier that year also in AERJ (p. 154). EH Harriman, having gained control of the Union Pacific, Southern Pacific, Oregon Railroad and Navigation Company, Oregon Short Line, Chicago & Alton, and Kansas City Southern lines in an 18,000-mile network, now sought to standardize locomotive and rail car construction details. This policy resulted in the launch of the the Harriman Standard locomotive series in July 1902. Further tweaking of the plans led to the adoption of standard Atlantic, Pacific, Consolidation, and 6-wheel switcher designs.

The Atlantic design detailed here is middle-of-the-road among 4-4-2s of the era. Its boiler is relatively modestly scaled for the volume of its cylinders, which raised its firebox/heating surface ratio to a relatively high value. See Locobase 1431 (Southern Pacific) and 4406 (Union Pacific) for examples and further commentary.

Specifications
ClassAtlantic A-105
Locobase ID5340
RailroadHarriman Lines
Whyte4-4-2
Road Numbers
GaugeStd
BuilderBurnham, Williams & Co
Year1905
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase27.58'
Ratio of driving wheelbase to overall engine wheebase 0.25
Overall Wheelbase (engine & tender)58.17'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers105000 lbs
Engine Weight196000 lbs
Tender Light Weight162200 lbs
Total Engine and Tender Weight358200 lbs
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight per yard of rail on which locomotive could run88 lb rail
Geometry Relating to Tractive Effort
Driver Diameter81"
Boiler Pressure200 psi
Cylinders (dia x stroke)20" x 28"
Tractive Effort23506 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Firebox Area174 sq. ft
Grate Area49.50 sq. ft
Evaporative Heating Surface2649
Superheating Surface
Combined Heating Surface2649
Evaporative Heating Surface/Cylinder Volume260.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9900
Same as above plus superheater percentage9900
Same as above but substitute firebox area for grate area34800
Power L19332
Power MT391.88

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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