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.
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|
|Railroad||Abilene & Southern||Abilene & Southern|
|Number in Class||1||1|
|Builder||Baldwin||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||11.50||13.50|
|Engine Wheelbase (ft)||19.83||20.12|
|Ratio of driving wheelbase to overall engine wheebase||0.58||0.67|
|Overall Wheelbase (engine & tender) (ft)||48.72||46.36|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||96,000||91,000|
|Engine Weight (lbs)||111,000||104,800|
|Tender Loaded Weight (lbs)||108,000||84,200|
|Total Engine and Tender Weight (lbs)||219,000||189,000|
|Tender Water Capacity (gals)||5500||3500|
|Tender Fuel Capacity (oil/coal) (gals/tons)||2100||8|
|Minimum weight of rail (calculated) (lb/yd)||53||51|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||50||57|
|Boiler Pressure (psi)||170||147|
|High Pressure Cylinders (dia x stroke) (in)||18" x 24"||19" x 24"|
|Tractive Effort (lbs)||22,473||18,992|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.27||4.79|
|Firebox Area (sq ft)||126||135|
|Grate Area (sq ft)||19.10||22.90|
|Evaporative Heating Surface (sq ft)||1287||1551|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||1287||1551|
|Evaporative Heating Surface/Cylinder Volume||182.07||196.93|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||3247||3366|
|Same as above plus superheater percentage||3247||3366|
|Same as above but substitute firebox area for grate area||21,420||19,845|