These were the first Pacifics on the Clinchfield (more formally the Carolina, Clinchfield, and Ohio). The P-1s had inside valves and outside valve gear, an extended smokebox, spread domes with the bell between, and coned second course to the boiler. They served until 1951.
As might be expected on a mountain-profiled coal railroad, these passenger-type Pacifics (works #41679-41680) also pulled fast freights. They followed an earlier group of three that had smaller cylinders. Railway Age (November 1914) characterized the hilly terrain over which they had to operated and said that passenger engines in such service "must have capacity to maintain a high drawbar pull for sustained periods, rather than the ability to run at unusually high speeds." This meant high tractive effort and a boiler big enough to supply steam even for long periods of late-cutoff operation. Note the relatively generous superheat and the relatively high cross-sectional area of the tubes and flues compared to the grate area (the A/S ratio).
No complaints here; the engines ran until 1953.
| Specifications | ||
|---|---|---|
| Class | P-1 | P-2 |
| Locobase ID | 3089 | 1322 |
| Railroad | Carolina, Clinchfield & Ohio | Carolina, Clinchfield & Ohio |
| Whyte | 4-6-2 | 4-6-2 |
| Road Numbers | 150-152 | 153-154 |
| Gauge | Std | Std |
| Builder | Baldwin | Baldwin |
| Year | 1910 | 1914 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 13' | 13' |
| Engine Wheelbase | 34.75' | 34.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.37 | 0.38 |
| Overall Wheelbase (engine & tender) | 66.21' | 66.94' |
| Axle Loading (Maximum Weight per Axle) | 52500 lbs | 60300 lbs |
| Weight on Drivers | 153900 lbs | 176900 lbs |
| Engine Weight | 235000 lbs | 280300 lbs |
| Tender Light Weight | 150000 lbs | 154600 lbs |
| Total Engine and Tender Weight | 385000 lbs | 434900 lbs |
| Tender Water Capacity | 8000 gals | 8000 gals |
| Tender Fuel Capacity (oil/coal) | 14 tons | 14 tons |
| Minimum weight per yard of rail on which locomotive could run | 85.50 lb rail | 98.28 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 69" |
| Boiler Pressure | 190 psi | 200 psi |
| Cylinders (dia x stroke) | 23" x 30" | 25" x 30" |
| Tractive Effort | 37145 lbs | 46196 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.14 | 3.83 |
| Heating Ability | ||
| Firebox Area | 248 sq. ft | |
| Grate Area | 54 sq. ft | 53.80 sq. ft |
| Evaporative Heating Surface | 4095 | 3982 |
| Superheating Surface | 955 | |
| Combined Heating Surface | 4095 | 4937 |
| Evaporative Heating Surface/Cylinder Volume | 283.86 | 233.63 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 10260 | 10760 |
| Same as above plus superheater percentage | 10260 | 12841.39 |
| Same as above but substitute firebox area for grate area | 0 | 59194.49 |
| Power L1 | 0 | 18645.08 |
| Power MT | 0 | 697.09 |
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