Washington & Plymouth 4-4-2 "Atlantic" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 10790)

Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 39, p.282-283. Works number was 20151 in February 1902.

Built in 1889, the W & P connected the two North Carolina towns with 33 miles of track until 1904, when it was converted to standard gauge and merged into the Norfolk & Southern.

This tiny 4-4-2 is a delightful miniature that stretched the definition of "Atlantic" beyond any other incarnation. It was bought to serve the passenger service that began in 1902. George Hilton (p. 461) reports that the 10 was the only Atlantic to operate on any American narrow-gauge line.

When the W & P converted to standard gauge, 10 was sold to the Norfolk County Lumber Company. From there, the engine went to the Wellington & Powellsville (aka the Walk & Push) and renumbered 9. It operated until 1926, when the W & P converted to standard gauge.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10,790
RailroadWashington & Plymouth
Number in Class1
Road Numbers10
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)4
Engine Wheelbase (ft)16.83
Ratio of driving wheelbase to overall engine wheebase 0.24
Overall Wheelbase (engine & tender) (ft)38.12
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)23,740
Engine Weight (lbs)45,060
Tender Loaded Weight (lbs)29,940
Total Engine and Tender Weight (lbs)75,000
Tender Water Capacity (gals)1500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)20
Geometry Relating to Tractive Effort
Driver Diameter (in)42
Boiler Pressure (psi)150
High Pressure Cylinders (dia x stroke) (in)10" x 18"
Tractive Effort (lbs)5464
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.34
Heating Ability
Firebox Area (sq ft)52
Grate Area (sq ft)12.40
Evaporative Heating Surface (sq ft)485
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)485
Evaporative Heating Surface/Cylinder Volume296.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1860
Same as above plus superheater percentage1860
Same as above but substitute firebox area for grate area7800
Power L14781
Power MT887.98


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