Norfolk & Western 4-4-2 "Atlantic" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

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 "Atlantic Type Locomotive for the Norfolk & Western", Railroad Gazette, Volume XXXV [35], No 6 (6 February 1903), p. 98.

Angus Sinclair (ed), Railway and Locomotive Engineering, March 1903, p. 134; N&W 12 - 1929 supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange; and DeGolyer, Volumes 25, p. 140 and 26, p. 270. (Thanks to Chris Hohl for his 10 December 2016 email pointing out the updated valve gear and his 18 March 2017 email noting the original coal capacity.) 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 Mechanical Engineer J A Pilcher under the direction of Superintendent of Motive Power W H Lewis that was delivered to the N&W in small numbers. Equalization was continuous along all five axles; adhesion weight could be adjusted by shifting the position of a spring that bore a casting that spanned the frame under the firebox.

The engines were delivered with 9 1/2" (241 mm) piston valves. Chris Hohl noticed in a 1917 photograph that the N&W replaced the original inside valve gear with the outside radial Baker-Pilliod gear. By that time weight on the drivers came to 85,390 lb (38,732 kg) while the engine's allup weight was reckoned as 167,700 lb (76,068 kg). Max axle loading weighed in at 43,370 lb (19,672 kg) and rested on the leading set of drivers.

Chris Hohl pointed out the original coal capacity in the Baldwin specs, which Locobase found hard to credit as it seemed so low. But the specs do indeed give the coal capacity as 10,000 lb (5 tons) or 4,534 kg. Given that the Railroad Gazette article in February 1903 gave the capacity as 10 tons, the lower figure is likely an error.

See excerpt from article reproduced on [] (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.

But for the N&W, the 4-4-2 layout was a bad fit and these were the only engines of that arrangement they bought or built. None was superheated and all had been retired by 1926.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID4093
RailroadNorfolk & Western (N&W)
Number in Class7
Road Numbers600-606
Number Built7
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.83 / 2.08
Engine Wheelbase (ft / m)28.71 / 8.75
Ratio of driving wheelbase to overall engine wheebase 0.24
Overall Wheelbase (engine & tender) (ft / m)53.01 / 16.16
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)80,930 / 36,709
Engine Weight (lbs / kg)169,090 / 76,698
Tender Loaded Weight (lbs / kg)100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)269,090 / 122,057
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)67 / 33.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)79 / 2007
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19" x 28" / 483x711
Tractive Effort (lbs / kg)21,751 / 9866.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.72
Heating Ability
Firebox Area (sq ft / m2)165 / 15.33
Grate Area (sq ft / m2)45.10 / 4.19
Evaporative Heating Surface (sq ft / m2)2884 / 267.93
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2884 / 267.93
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 area33,000
Power L110,630
Power MT579.15

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