Abilene & Southern 4-4-0 "American" Locomotives in 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 Rail Data Exchange.

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 number 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.

Principal Dimensions 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 / m) 8.85 / 2.70
Engine Wheelbase (ft / m)24.75 / 7.54
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft / m)48.79 / 14.87
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)74,000 / 33,566
Engine Weight (lbs / kg)107,540 / 48,779
Tender Loaded Weight (lbs / kg)82,460 / 37,403
Total Engine and Tender Weight (lbs / kg)190,000 / 86,182
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 1575
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660
Tractive Effort (lbs / kg)16,169 / 7334.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.58
Heating Ability
Firebox Area (sq ft / m2)110.60 / 10.28
Grate Area (sq ft / m2)17 / 1.58
Evaporative Heating Surface (sq ft / m2)1426 / 132.53
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1426 / 132.53
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

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