Norfolk & Western / Ohio & Northwestern 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 1/O-20 (Locobase 15950)

Data from CofGa 1905 and CofGa 11 - 1927 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 13, p. 203. Works numbers were 8905-8906 in November 1887

The Covington & Macon ordered three locomotives in November 1886 that were identical to the earlier order described in Locobase 7924. None of the three was delivered to the C&M. These two were sold to the O&NW in March 1888, which became the Cincinnati Portsmouth & Virginia in 1891 and was taken into the Norfolk & Western in 1901.

Both were scrapped in November 1905.


Class 29 / N (Locobase 11866)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 13, p. 194. Works numbers were 8417-8418 in March 1887; 8602-8604, 8606 in June.

All of these Eight-wheelers were later upgraded to N1s, which had 18 1/2" cylinders and taller drivers.


Class N1 (Locobase 9715)

Data from Angus Sinclair, "Ratio of Heating Surface to Grate Area and Cylinder Volume," Locomotive Engineering, Volume X, No. 4 (April 1897), pp. 316-318. These engines were delivered in March 1888.

Specifications by Steve Llanso of Sweat House Media
Class1/O-2029 / NN1
Locobase ID15,950 11,866 9715
RailroadOhio & Northwestern (N&W)Norfolk & Western (N&W)Norfolk & Western (N&W)
CountryUSAUSAUSA
Whyte4-4-04-4-04-4-0
Number in Class165
Road Numbers1-2/713-714/513-51429-31, 33, 35, 3728, 30, 32, 34, 36
GaugeStdStdStd
Number Built165
BuilderBurnham, Parry, Williams & CoBurnham, Parry, Williams & CoRogers
Year188718871888
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.449 / 2.749
Engine Wheelbase (ft / m)21.75 / 6.6324.54 / 7.4824.54
Ratio of driving wheelbase to overall engine wheebase 0.37 0.37 0.37
Overall Wheelbase (engine & tender) (ft / m)48.24 / 14.7047.58
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)46,000 / 20,86564,000 / 29,03075,175 / 34,099
Engine Weight (lbs / kg)72,000 / 32,65995,000 / 43,091101,050 / 45,836
Tender Loaded Weight (lbs / kg)61,300 / 27,805
Total Engine and Tender Weight (lbs / kg)133,300 / 60,464
Tender Water Capacity (gals / ML)2800 / 10.613000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.30
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 1953 / 26.5063 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160062 / 157568 / 1575
Boiler Pressure (psi / kPa)135 / 9.30140 / 9.70140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x61018" x 24" / 457x61018.5" x 24" / 457x610
Tractive Effort (lbs / kg)11,191 / 5076.1614,925 / 6769.8714,375 / 6520.40
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.11 4.29 5.23
Heating Ability
Firebox Area (sq ft / m2)103 / 9.57132 / 12.27141.80 / 13.18
Grate Area (sq ft / m2)15.20 / 1.4118.70 / 1.7418.50 / 1.72
Evaporative Heating Surface (sq ft / m2)1133 / 105.261613 / 149.911612 / 149.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1133 / 105.261613 / 149.911612 / 149.81
Evaporative Heating Surface/Cylinder Volume202.86228.19215.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation205226182590
Same as above plus superheater percentage205226182590
Same as above but substitute firebox area for grate area13,90518,48019,852
Power L1418346524932
Power MT400.95320.50289.28