Philadelphia & Reading 2-10-0 "Decapod" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class J1-sa (Locobase 10017)

Data from RDG 11-1926 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See the quite detailed overview published by designer Alphonse I Lipetz, "Russian 'Decapod' Locomotives", The Railway Engineer, Volume 43, No 2 (February 1922), pp. 51-54; April 1922, pp. 136-137; July 1922, pp. 249-251; and November 1922, pp. 415-417. Many thanks to Jane Macken for asking about this class.

As noted in Locobase 381, Baldwin and Alco (Richmond and Schenectady Works) built hundreds of these Decapods for the Russian Government in 1916-1918. When that empire was overthrown, some 200 of the Russian order was diverted to railroads in the US.

The Reading's quartet consisted of three that were built as a batch (Baldwin works numbers were 47366-47368 in December 1917). These were close to being shipped and already received their Russian designations and road numbers (Ye 926-928). When the USRA took over the orphaned Decks, these received the lowest USRA numbers: 1101-1103.

A later single (works 48016 in March 1918) originally operated for the Reading's Central of New Jersey under the USRA's management. Its road number at that time was 1162. Returned to private control in 1920, the engine was sold in 1924 to the Reading.

Although a good design in its own right, the Russian decapod didn't fit particularly well with the Reading's power requirements and all 4 locomotives were scrapped in March 1935.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10017
RailroadPhiladelphia & Reading
Number in Class4
Road Numbers1126-1129
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase18.33'
Engine Wheelbase27.83'
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender)60.29'
Axle Loading (Maximum Weight per Axle)42550 lbs
Weight on Drivers183000 lbs
Engine Weight208400 lbs
Tender Light Weight142200 lbs
Total Engine and Tender Weight350600 lbs
Tender Water Capacity7000 gals
Tender Fuel Capacity (oil/coal)8.8 tons
Minimum weight of rail (calculated)61 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter52"
Boiler Pressure180 psi
Cylinders (dia x stroke)25" x 28"
Tractive Effort51490 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.55
Heating Ability
Firebox Area227 sq. ft
Grate Area64.70 sq. ft
Evaporative Heating Surface2610 sq. ft
Superheating Surface579 sq. ft
Combined Heating Surface3189 sq. ft
Evaporative Heating Surface/Cylinder Volume164.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11646
Same as above plus superheater percentage13742
Same as above but substitute firebox area for grate area48215
Power L18783
Power MT529.05


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