Locobase 13648 shows the saturated Moguls that arrived earlier in 1913. This entry duplicated that design except for the substitution of 22 flues for 120 tubes in order to accommodate the superheater.
It served the PS&N for more than 20 years before it was scrapped in 1936.
Only 8 years into what would be a terminal receivership that resulted in its abandonment in 1947, the PS & N nevertheless could and did restock its roster with new equipment. These relatively large Moguls headed both passenger and freight trains. Their service ended in December 1936 and they were scrapped.
Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004. Rumary-Lambert credit the design with a 26" stroke, but the catalog said 24" and that's closer to contemporary information.
Fitted with crown bar, wagon top boiler with steam dome just ahead of the cab. The tender sloped, presumably because this engine would be backing up as often as going forward in its branch-line duties.
When they were delivered, the railroad was known as the Buffalo & St Mary's, but it acquired the "Southwestern" very shortly thereafter. And by 1899, the railroad was absorbed by the Pittsburgh, Shawmut & Northern and the two engines were renumbered 20-21.
20 was scrapped in 1929 and 21 in December 1934.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Pittsburg, Shawmut & Northern||Pittsburg, Shawmut & Northern||Buffalo, St.Mary's & SouthWestern (PS&N)|
|Number in Class||1||2||2|
|Road Numbers||15||16-17||5, 11/20-21|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||14||14||13|
|Engine Wheelbase (ft)||22.17||22.17||20.50|
|Ratio of driving wheelbase to overall engine wheebase||0.63||0.63||0.63|
|Overall Wheelbase (engine & tender) (ft)||51.77||51.77||47.17|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||139,000||126,000||108,000|
|Engine Weight (lbs)||163,000||148,000||124,000|
|Tender Loaded Weight (lbs)||100,000||100,000||72,000|
|Total Engine and Tender Weight (lbs)||263,000||248,000||196,000|
|Tender Water Capacity (gals)||5000||5000||3100|
|Tender Fuel Capacity (oil/coal) (gals/tons)||10||10||4|
|Minimum weight of rail (calculated) (lb/yd)||77||70||60|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||63||63||57|
|Boiler Pressure (psi)||180||180||180|
|High Pressure Cylinders (dia x stroke) (in)||20" x 26"||20" x 26"||18" x 24"|
|Tractive Effort (lbs)||25,257||25,257||20,872|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||5.50||4.99||5.17|
|Firebox Area (sq ft)||155||155||168|
|Grate Area (sq ft)||30||30||23.30|
|Evaporative Heating Surface (sq ft)||1644||2040||1623|
|Superheating Surface (sq ft)||315|
|Combined Heating Surface (sq ft)||1959||2040||1623|
|Evaporative Heating Surface/Cylinder Volume||173.90||215.78||229.61|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||5400||5400||4194|
|Same as above plus superheater percentage||6264||5400||4194|
|Same as above but substitute firebox area for grate area||32,364||27,900||30,240|