Wilmington & Northern 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 16 (Locobase 15808)

Data from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Vol 14, p. 172. Works numbers were 9324 in June 1888 and 9532 in October.

Opened in 1870 as the Wilmington & Brandywine and renamed Wilmington & Reading in 1870, the W&N ran north up the Brandywine Valley from Wilmington, Del into Pennsylvania and on up to Reading, Pa. Route mileage came to 88-90 miles (142-150 km).

The line was leased to the Reading in 1900.

These two mixed-traffic Eight-wheelers were typical of Baldwin-built 4-4-0s of the time. They put in almost thirty years on the W&N before their retirements in October 1910 and October 1914, respectively.

NB: The firebox heating surface area is based on the known value of the Spokane Falls & Northern locomotives built by Baldwin in 1890 (Locobase 8864). The depths of the two fireboxes were identical as was the width. Length differed by 2 1/4", which is accounted for in the estimate .

Specifications by Steve Llanso of Sweat House Media
Locobase ID15808
RailroadWilmington & Northern (Reading)
Number in Class2
Road Numbers16, 18/258-259
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 8.50'
Engine Wheelbase22.75'
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers52000 lbs
Engine Weight80000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity2400 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)43 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter62"
Boiler Pressure130 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort12362 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21
Heating Ability
Firebox Area116 sq. ft
Grate Area17.10 sq. ft
Evaporative Heating Surface1278 sq. ft
Superheating Surface
Combined Heating Surface1278 sq. ft
Evaporative Heating Surface/Cylinder Volume202.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2223
Same as above plus superheater percentage2223
Same as above but substitute firebox area for grate area15080
Power L13959
Power MT335.70

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