It's not unheard of, but the PS & N's road numbering order did not match the builder's number order. So the road number sequence was 53, 55, 50, 51-52, 54. The design is very similar to the Kansas City Southern's E-2 Consolidations delivered in the same year (Locobase 6842).
The class remained on the western Pennsylvania coal road until their retirements. 52 and 54 were scrapped in December 1936, 51 in March 1947. 53 and 55 were rebuilt by Baldwin in 1920.
Following the H-3s (Locobase 12641) into service, this definitive PS & N Consolidation design had only detail differences such as 6 more boiler tubes. Still, the design would be modified just a few years later; see Locobase 12779.
56 was scrapped in December 1936. 57 was rebuilt by Baldwin in 1920; in its altered form the engine lasted until March 1943. 58-59 were scrapped 4 years later in March 1947.
When it came time to order more H-4 Consolidations, the PS & N varied the design from the earlier engines (for which, see Locobase 12779) by reducing the number of tubes by 27. Possibly they found that the spacing was too cramped or the boiler not big enough to hold steam comfortably. The builder also introduced Walschaert's outside radial valve gear in place of the link motion used in the earlier locomotives.
In any case, the design was little changed otherwise and like the earlier engines, served the railroad until it was closed and abandoned in March 1947.
|Specifications by Steve Llanso of Sweat House Media|
|Class||H-3||H-4||H-4 - 1910|
|Railroad||Pittsburg, Shawmut & Northern||Pittsburg, Shawmut & Northern||Pittsburg, Shawmut & Northern|
|Number in Class||6||12||8|
|Builder||Burnham, Williams & Co||Burnham, Williams & Co||Baldwin|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||14.50||14.50||14.50|
|Engine Wheelbase (ft)||23||23||23|
|Ratio of driving wheelbase to overall engine wheebase||0.63||0.63||0.63|
|Overall Wheelbase (engine & tender) (ft)|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||175,000||175,000||180,000|
|Engine Weight (lbs)||195,000||195,000||196,000|
|Tender Loaded Weight (lbs)||140,000||140,000|
|Total Engine and Tender Weight (lbs)||335,000||336,000|
|Tender Water Capacity (gals)||6000||7000||7000|
|Tender Fuel Capacity (oil/coal) (gals/tons)||14|
|Minimum weight of rail (calculated) (lb/yd)||73||73||75|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||51||51||51|
|Boiler Pressure (psi)||200||200||200|
|High Pressure Cylinders (dia x stroke) (in)||22" x 28"||22" x 28"||22" x 28"|
|Tractive Effort (lbs)||45,173||45,173||45,173|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.87||3.87||3.98|
|Firebox Area (sq ft)||174.60||174.60||177|
|Grate Area (sq ft)||57||57||57|
|Evaporative Heating Surface (sq ft)||3246||3292||3102|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||3246||3292||3102|
|Evaporative Heating Surface/Cylinder Volume||263.49||267.23||251.80|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||11,400||11,400||11,400|
|Same as above plus superheater percentage||11,400||11,400||11,400|
|Same as above but substitute firebox area for grate area||34,920||34,920||35,400|