Abilene & Southern / Arkansas Southern 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class C (Locobase 7360)

Data from AB&SOU 6 -1919 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The A&S Eight-wheeler was "used", but its provenance is unknown to Locobase; one source says that the 13 was rebuilt from A&S's 1888 Baldwin, road #9. This engine may have originally been delivered to the Fort Worth & Denver.

A comparison with a very similar engine from another builder in the same year -- the Union Pacific's 780 class of ten locomotives delivered by Brooks -- shows an identically sized boiler and the same cylinder volume, but the Brooks engine had slightly larger grate, 1" taller drivers, and a pressure set at 150 psi. The A & S engine put 5 1/2 more tons on the drivers.

Class Dot (Locobase 12062)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 18, p 133. Works number was 13166 in December 1893.

This little Eight-wheeler went into service on this little short line. The AS would connect Camden, Ark with Ruston, Louisiana by 1900. By 1906, Dot was too small for the service it performed so the AS RR sold it to the Tremont Lumber Company, which renumbered it 51.

Specifications by Steve Llanso of Sweat House Media
Locobase ID7360 12062
RailroadAbilene & SouthernArkansas Southern
Number in Class11
Road Numbers131
Number Built1
BuilderBaldwinBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase 8.85' 6.50'
Engine Wheelbase24.75'19.08'
Ratio of driving wheelbase to overall engine wheebase 0.36 0.34
Overall Wheelbase (engine & tender)48.79'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers74000 lbs30000 lbs
Engine Weight107540 lbs50000 lbs
Tender Light Weight82460 lbs
Total Engine and Tender Weight190000 lbs
Tender Water Capacity4000 gals1500 gals
Tender Fuel Capacity (oil/coal)12 tons tons
Minimum weight of rail (calculated)62 lb/yard25 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter62"56"
Boiler Pressure140 psi130 psi
Cylinders (dia x stroke)18" x 26"12" x 22"
Tractive Effort16169 lbs6251 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.58 4.80
Heating Ability
Firebox Area110.60 sq. ft63.40 sq. ft
Grate Area17 sq. ft12.10 sq. ft
Evaporative Heating Surface1426 sq. ft521 sq. ft
Superheating Surface
Combined Heating Surface1426 sq. ft521 sq. ft
Evaporative Heating Surface/Cylinder Volume186.22180.92
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23801573
Same as above plus superheater percentage23801573
Same as above but substitute firebox area for grate area154848242
Power L137393531
Power MT222.79518.97

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