In 1943, the RF&P bought ten "Berkshire" type locomotives from the Lima Locomotives Works. These locomotives were assigned road numbers 571 through 580 and were similar to the Nickel Plate and the Pere Marquette design. They had 69" diameter drivers, 25" x 34" cylinders, a 245 psi boiler pressure, they exerted 64,100 pounds of tractive effort and each weighed 433,200 pounds.
They did not last long on the RF&P as they were retired in 1952 There are no surviving RF&P 2-8-4 "Berkshire" type locomotives.
|Qty.||Road Numbers||Year Built||Builder||Notes|
|10||571-580||1943||Lima||Numbers 571-589 scrapped in 1952|
Firebox heating surface included the area of the combustion chamber, 98 sq ft (9.1sq m) of thermic syphons, and 19 sq ft (1.75 sq m) of arch tubes. The boiler was fitted with a Worthington 5 SA feed water heater.
Procured only because of the drought of diesels during World War II, these worthy steamers duplicated the design of such Berkshires as the Chessie's K-4 (Locobase 55) and Pere Marquette's N-1 (Locobase 54). The 1934 Nickel Plate locomotives usually cited as the template (Locobase 52) had a few more boiler tubes and thus more heating surface area. All were Limas, all had Baker valve gear, and all were exemplars of the Superpower formula.
The RF&P locomotives were taken out of service by 1952 as the RF&P converted to an all-diesel roster.
|Specifications by Steve Llanso|
|Railroad||Richmond, Fredericksburg & Potomac (RF&P)|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.43|
|Overall Wheelbase (engine & tender)||94.06'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||271000 lbs|
|Engine Weight||434000 lbs|
|Tender Light Weight||381850 lbs|
|Total Engine and Tender Weight||815850 lbs|
|Tender Water Capacity||22000 gals|
|Tender Fuel Capacity (oil/coal)||25 tons|
|Minimum weight of rail (calculated) on which locomotive could run||113 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||245 psi|
|Cylinders (dia x stroke)||25" x 34"|
|Tractive Effort||64135 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.23|
|Firebox Area||461 sq. ft|
|Grate Area||90.30 sq. ft|
|Evaporative Heating Surface||4772 sq. ft|
|Superheating Surface||1932 sq. ft|
|Combined Heating Surface||6704 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||247.04|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22124|
|Same as above plus superheater percentage||28539|
|Same as above but substitute firebox area for grate area||145699|