Atlantic Coast Line 2-10-0 "Decapod" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class O (Locobase 4400)

857 2-10-0s were built by Baldwin and Alco (Richmond and Schenectady Works) for the Russian Government. When that empire was overthrown, some 200 more of the Russian order was diverted to railroads in the US, including the ACL.

Ilustrations in Linn Wescott (Model Railroader Cyclopedia - Vol 1, 1960) and see Drury (1993), 176. 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.

Specifications by Steve Llanso of Sweat House Media
Locobase ID4400
RailroadAtlantic Coast Line (ACL)
Number in Class10
Road Numbers8000-8009
Number Built10
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)18.33
Engine Wheelbase (ft)27.54
Ratio of driving wheelbase to overall engine wheebase 0.67
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)35,000
Weight on Drivers (lbs)175,000
Engine Weight (lbs)197,900
Tender Light Weight (lbs)133,000
Total Engine and Tender Weight (lbs)330,900
Tender Water Capacity (gals)7400
Tender Fuel Capacity (oil/coal) (gals/tons) 8.80
Minimum weight of rail (calculated) (lb/yd)58
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) 3.40
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 MT553.23


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