Philadelphia & Reading 2-10-0 "Decapod" Locomotives in 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 Rail Data Exchange. 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 and thanks to Chris Hohl for his 8 February 2019 email correcting the Russian decapods' wheelbases, adhesion, tender, and engine weights.) Works numbers were 47366-47368 in December 1917.

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. Although all of the Russian decks were built to a common specification, several US railroads published later diagrams that reflected either updates or their own standards of measurements.

The Reading's quartet consisted of three that were built as a batch. 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.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID10017
RailroadPhiladelphia & Reading
Number in Class4
Road Numbers1126-1129
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18.33 / 5.59
Engine Wheelbase (ft / m)27.83 / 8.48
Ratio of driving wheelbase to overall engine wheelbase 0.66
Overall Wheelbase (engine & tender) (ft / m)60.29 / 18.38
Axle Loading (Maximum Weight per Axle) (lbs / kg)42,550 / 19,300
Weight on Drivers (lbs / kg)183,500 / 83,008
Engine Weight (lbs / kg)208,400 / 94,529
Tender Loaded Weight (lbs / kg)132,000 / 64,501
Total Engine and Tender Weight (lbs / kg)340,400 / 159,030
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 8.80 / 8
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)25" x 28" / 635x711
Tractive Effort (lbs / kg)51,490 / 23355.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56
Heating Ability
Tubes (number - dia) (in / mm)194 - 2" / 51
Flues (number - dia) (in / mm)28 - 5.5" / 140
Flue/Tube length (ft / m)17 / 5.18
Firebox Area (sq ft / m2)227 / 21.10
Grate Area (sq ft / m2)64.70 / 6.01
Evaporative Heating Surface (sq ft / m2)2610 / 242.57
Superheating Surface (sq ft / m2)579 / 53.81
Combined Heating Surface (sq ft / m2)3189 / 296.38
Evaporative Heating Surface/Cylinder Volume164.05
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 L18781
Power MT527.49

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Wes Barris