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. DeGolyer, Volume 30, p. 30 (among others).
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 Middle Run Media | |
|---|---|
| Class | Light Pacific P-141 |
| Locobase ID | 5341 |
| Railroad | Harriman Lines |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | |
| Road Numbers | |
| Gauge | Std |
| Number Built | |
| Builder | Burnham, Williams & Co |
| Year | 1905 |
| Valve Gear | Stephenson |
| 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 wheelbase | 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 / Liters/MT) | 10 / 9 |
| 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 / 1380 |
| 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 | |
| Tubes (number - dia) (in / mm) | 245 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 20 / 6.10 |
| 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 Volume | 247.40 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9900 |
| Same as above plus superheater percentage | 9900 |
| Same as above but substitute firebox area for grate area | 34,800 |
| Power L1 | 8163 |
| Power MT | 382.90 |