Norfolk & Western 4-4-2 "Atlantic" Type Locomotives

Class Details by Steve Llanso

Class J (Locobase 4093)

Taken from a table in Paul T Warner's article on Atlantics in the Railway & Locomotive Historical Society Bulletin #62 (1943, p 20), with additional information from

Angus Sinclair (ed), Railway and Locomotive Engineering, March 1903, p. 134. Works numbers were 22178, 22180, 22254, 22292 in May 1903; 22309, 22367 in June; and 23922

in March 1904.

This was a relatively small Atlantic designed by Superintendent of Motive Power W H Lewis that was delivered to the N&W in small numbers. Equalization was continuous along all 5 axles; adhesion weight could be adjusted by shifting the position of a spring that bore a casting that spanned the frame under the firebox.

See excerpt from article reproduced on http://www.usgennet.org/usa/topic/preservation/educator/book4/pg438.htm (4 April 2004). The N&W J is used as an example of the gains made when the builder put a trailing axle under the boiler.


Specifications by Steve Llanso
ClassJ
Locobase ID4093
RailroadNorfolk & Western (N&W)
CountryUSA
Whyte4-4-2
Road Numbers600-606
GaugeStd
BuilderBurnham, Williams & Co
Year1903
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 6.83'
Engine Wheelbase28.71'
Ratio of driving wheelbase to overall engine wheebase 0.24
Overall Wheelbase (engine & tender)53.01'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers80930 lbs
Engine Weight169090 lbs
Tender Light Weight100000 lbs
Total Engine and Tender Weight269090 lbs
Tender Water Capacity6000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated) on which locomotive could run67 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter79"
Boiler Pressure200 psi
Cylinders (dia x stroke)19" x 28"
Tractive Effort21751 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.72
Heating Ability
Firebox Area165 sq. ft
Grate Area45.10 sq. ft
Evaporative Heating Surface2884 sq. ft
Superheating Surface
Combined Heating Surface2884 sq. ft
Evaporative Heating Surface/Cylinder Volume313.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9020
Same as above plus superheater percentage9020
Same as above but substitute firebox area for grate area33000
Power L110630
Power MT579.15

Credits

Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.