Harriman Lines 4-6-2 "Pacific" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)13.33 / 4.06
Engine Wheelbase (ft / m)33.33 / 10.16
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender) (ft / m)63.87 / 19.47
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)141,000 / 63,957
Engine Weight (lbs / kg)222,000 / 100,698
Tender Loaded Weight (lbs / kg)162,200 / 73,573
Total Engine and Tender Weight (lbs / kg)384,200 / 174,271
Tender Water Capacity (gals / ML)9000 / 34.09
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)78 / 39
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)77 / 1956
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)22" x 28" / 559x711
Tractive Effort (lbs / kg)29,920 / 13571.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.71
Heating Ability
Firebox Area (sq ft / m2)174 / 16.17
Grate Area (sq ft / m2)49.50 / 4.60
Evaporative Heating Surface (sq ft / m2)3048 / 283.27
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3048 / 283.27
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 area34,800
Power L18163
Power MT382.90

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