These four locomotives had 28 x 30 cylinders, 73" drivers and a 210 psi boiler pressure which gave them 57,500 pounds of tractive effort. Each weighed 381,000 pounds and were 93" - 6" long (including tenders). The tender had a 10,000 gallon water tank and a 16 ton coal bunker.
The RF&P retired these locomotives in 1950 and there are no surviving examples.
Delivered in pairs in 1924 & 1925 with boilers pressing 200 psi, but later increased to 225 psi. Firebox heating surface included 95 sq ft of syphons, 16 sq ft of arch tubes.
They lasted until 1950.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Richmond, Fredericksburg & Potomac (RF&P)|
|Number in Class||4|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.47|
|Overall Wheelbase (engine & tender)||81.75'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||262000 lbs|
|Engine Weight||381000 lbs|
|Tender Light Weight||201600 lbs|
|Total Engine and Tender Weight||582600 lbs|
|Tender Water Capacity||10000 gals|
|Tender Fuel Capacity (oil/coal)||16 tons|
|Minimum weight of rail (calculated)||109 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||225 psi|
|Cylinders (dia x stroke)||28" x 30"|
|Tractive Effort||61619 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.25|
|Firebox Area||465 sq. ft|
|Grate Area||75 sq. ft|
|Evaporative Heating Surface||4762 sq. ft|
|Superheating Surface||1190 sq. ft|
|Combined Heating Surface||5952 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||222.73|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||16875|
|Same as above plus superheater percentage||20250|
|Same as above but substitute firebox area for grate area||125550|