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 ID10,017
RailroadPhiladelphia & Reading
Number in Class4
Road Numbers1126-1129
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)18.33
Engine Wheelbase (ft)27.83
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender) (ft)60.29
Axle Loading (Maximum Weight per Axle) (lbs)42,550
Weight on Drivers (lbs)183,000
Engine Weight (lbs)208,400
Tender Light Weight (lbs)142,200
Total Engine and Tender Weight (lbs)350,600
Tender Water Capacity (gals)7000
Tender Fuel Capacity (oil/coal) (gals/tons) 8.80
Minimum weight of rail (calculated) (lb/yd)61
Geometry Relating to Tractive Effort
Driver Diameter (in)52
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)25" x 28"
Tractive Effort (lbs)51,490
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.55
Heating Ability
Firebox Area (sq ft)227
Grate Area (sq ft)64.70
Evaporative Heating Surface (sq ft)2610
Superheating Surface (sq ft)579
Combined Heating Surface (sq ft)3189
Evaporative Heating Surface/Cylinder Volume164.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,646
Same as above plus superheater percentage13,742
Same as above but substitute firebox area for grate area48,215
Power L18783
Power MT529.05


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