Seattle Warehouse & Terminal 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1/H-4 (Locobase 8152)

Data from 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works number was 2210 in June 1889.

The locomotive diagram shows a dock switcher with a long boiler on which little sand domes flanked a taller steam dome -- all of them shaped like milk cans. It seems to have been intended for bi-directional operation.

The SW&T sold the 1 to locomotive rebuilder/reseller Southern Iron & Equipment in 1901. SI&E sold it to the Northern Pacific in October 1903.

NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.

Specifications by Steve Llanso of Sweat House Media
Locobase ID8152
RailroadSeattle Warehouse & Terminal (NP)
Number in Class1
Road Numbers1/1071
Number Built1
BuilderRhode Island
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase6'
Engine Wheelbase20'
Ratio of driving wheelbase to overall engine wheebase 0.30
Overall Wheelbase (engine & tender)20'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers50500 lbs
Engine Weight76000 lbs
Tender Light Weight
Total Engine and Tender Weight76000 lbs
Tender Water Capacity800 gals
Tender Fuel Capacity (oil/coal)1.5 tons
Minimum weight of rail (calculated)42 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter48"
Boiler Pressure140 psi
Cylinders (dia x stroke)14" x 20"
Tractive Effort9718 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.20
Heating Ability
Firebox Area63 sq. ft
Grate Area11.88 sq. ft
Evaporative Heating Surface564 sq. ft
Superheating Surface
Combined Heating Surface564 sq. ft
Evaporative Heating Surface/Cylinder Volume158.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1663
Same as above plus superheater percentage1663
Same as above but substitute firebox area for grate area8820
Power L12763
Power MT241.24


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