Harriman Lines 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Light Pacific P-141 (Locobase 5341)

See Locobase 5340 for the introduction to the Harriman Common Standard. Data from "Report of Committe on Power-Chicago, Rock Island & Pacific Railway-Descriptions of Standard Types of Locomotives," American Engineer and Railroad Journal, Volume 79 (March 1905), pp. 84-86.

The HCS Pacifics were relatively light engines and like the Atlantic, relatively small boilered.

Many were eventually superheated and fitted with Walschaerts outside valve gear.

See Locobase 5313 (Chicago & Alton), 4407 (Southern Pacific), and 4408 (Union Pacific) for examples of the HCS Pacific design.

Specifications by Steve Llanso of Sweat House Media
ClassLight Pacific P-141
Locobase ID5341
RailroadHarriman Lines
Number in Class
Road Numbers
Number Built
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase13.33'
Engine Wheelbase33.33'
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender)63.87'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers141000 lbs
Engine Weight222000 lbs
Tender Light Weight162200 lbs
Total Engine and Tender Weight384200 lbs
Tender Water Capacity9000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)78 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter77"
Boiler Pressure200 psi
Cylinders (dia x stroke)22" x 28"
Tractive Effort29920 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.71
Heating Ability
Firebox Area174 sq. ft
Grate Area49.50 sq. ft
Evaporative Heating Surface3048 sq. ft
Superheating Surface
Combined Heating Surface3048 sq. ft
Evaporative Heating Surface/Cylinder Volume247.42
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 L18163
Power MT382.90

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