Abilene & Southern 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 12 (Locobase 8501)

Data from T&P 1953ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase is intrigued by the calculations that must have underlay a 1920s decision concerning this locomotive. In Locobase 7359, we describe A & S's 12 4-4-0, a Pittsburgh LW product from 1881. We note that a later roster shows the engine to have been retired in 1919.

Retired, perhaps, but not scrapped, obviously, because seven years later the engine was taken in hand by Baldwin and rebuilt as a 2-6-0. (Says so right in the diagram ...)

The math intrigues - the railroad takes a 45-year-old locomotive and puts much smaller drivers under a boiler that had to have been reworked. The cylinder volume remains the same and the heating surfaces are approximately equal, but what of this engine could have had an 1881 date stamp?

Whatever the reason (maybe the railroad could get money for repairs, but not new acquistions, e.g.), the revived #12 carried on another 8 years and was scrapped, for sure, in 1934.

Class E (Locobase 7361)

Data from AB&SOU 6 -1919 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works number was 10176.

The A&S had this Mogul as the most powerful locomotive of the four to six that remained in service in the 1910s. Locobase correctly divined that this engine was purchased used in January by the A & S from the Missouri-Kansas-Texas Railway's D4 class of Moguls.

By 1919, only four engines were still active.

Specifications by Steve Llanso of Sweat House Media
Locobase ID8501 7361
RailroadAbilene & SouthernAbilene & Southern
Number in Class11
Road Numbers1217
Number Built
BuilderBaldwinBurnham, Williams & Co
Valve GearWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)11.5013.50
Engine Wheelbase (ft)19.8320.12
Ratio of driving wheelbase to overall engine wheebase 0.58 0.67
Overall Wheelbase (engine & tender) (ft)48.7246.36
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)96,00091,000
Engine Weight (lbs)111,000104,800
Tender Loaded Weight (lbs)108,00084,200
Total Engine and Tender Weight (lbs)219,000189,000
Tender Water Capacity (gals)55003500
Tender Fuel Capacity (oil/coal) (gals/tons)21008
Minimum weight of rail (calculated) (lb/yd)5351
Geometry Relating to Tractive Effort
Driver Diameter (in)5057
Boiler Pressure (psi)170147
High Pressure Cylinders (dia x stroke) (in)18" x 24"19" x 24"
Tractive Effort (lbs)22,47318,992
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.27 4.79
Heating Ability
Firebox Area (sq ft)126135
Grate Area (sq ft)19.1022.90
Evaporative Heating Surface (sq ft)12871551
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)12871551
Evaporative Heating Surface/Cylinder Volume182.07196.93
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation32473366
Same as above plus superheater percentage32473366
Same as above but substitute firebox area for grate area21,42019,845
Power L138423947
Power MT264.69286.87

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