Abilene & 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.

Specifications by Steve Llanso of Sweat House Media
Locobase ID7360
RailroadAbilene & Southern
Number in Class1
Road Numbers13
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 8.85
Engine Wheelbase (ft)24.75
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft)48.79
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)74,000
Engine Weight (lbs)107,540
Tender Loaded Weight (lbs)82,460
Total Engine and Tender Weight (lbs)190,000
Tender Water Capacity (gals)4000
Tender Fuel Capacity (oil/coal) (gals/tons)12
Minimum weight of rail (calculated) (lb/yd)62
Geometry Relating to Tractive Effort
Driver Diameter (in)62
Boiler Pressure (psi)140
High Pressure Cylinders (dia x stroke) (in)18" x 26"
Tractive Effort (lbs)16,169
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.58
Heating Ability
Firebox Area (sq ft)110.60
Grate Area (sq ft)17
Evaporative Heating Surface (sq ft)1426
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1426
Evaporative Heating Surface/Cylinder Volume186.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2380
Same as above plus superheater percentage2380
Same as above but substitute firebox area for grate area15,484
Power L13739
Power MT222.79

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.