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 ID10790
RailroadWashington & Plymouth
Number in Class1
Road Numbers10
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase4'
Engine Wheelbase16.83'
Ratio of driving wheelbase to overall engine wheebase 0.24
Overall Wheelbase (engine & tender)38.12'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers23740 lbs
Engine Weight45060 lbs
Tender Light Weight29940 lbs
Total Engine and Tender Weight75000 lbs
Tender Water Capacity1500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)20 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure150 psi
Cylinders (dia x stroke)10" x 18"
Tractive Effort5464 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.34
Heating Ability
Firebox Area52 sq. ft
Grate Area12.40 sq. ft
Evaporative Heating Surface485 sq. ft
Superheating Surface
Combined Heating Surface485 sq. ft
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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