Pittsburg, Shawmut & Northern 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class H-3 (Locobase 12641)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 25, p. 112. Works numbers were 22359, 22415 in in June 1903; 23939, 23979-23980 in March 1904; and 24043. in April.

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.


Class H-4 (Locobase 12778)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 27, p. 247. Works numbers were 25486, 25556, 25598, 25672 in May 1905; 30227, 30298 in February 1907; 32769-32771, 32782-32783 in May 1908; 32807 in June.

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.


Class H-4 - 1910 (Locobase 12779)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 38, p. 229. Works numbers were 35810-35811 in December 1910; 35822-35825, 35992 in January 1911; 36035 in February.

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
ClassH-3H-4H-4 - 1910
Locobase ID12641 12778 12779
RailroadPittsburg, Shawmut & NorthernPittsburg, Shawmut & NorthernPittsburg, Shawmut & Northern
CountryUSAUSAUSA
Whyte2-8-02-8-02-8-0
Number in Class6128
Road Numbers50-5556-6768-75
GaugeStdStdStd
Number Built6128
BuilderBurnham, Williams & CoBurnham, Williams & CoBaldwin
Year190319051910
Valve GearStephensonStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase14.50'14.50'14.50'
Engine Wheelbase23'23'23'
Ratio of driving wheelbase to overall engine wheebase 0.63 0.63 0.63
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers175000 lbs175000 lbs180000 lbs
Engine Weight195000 lbs195000 lbs196000 lbs
Tender Light Weight140000 lbs140000 lbs
Total Engine and Tender Weight335000 lbs336000 lbs
Tender Water Capacity6000 gals7000 gals7000 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight of rail (calculated)73 lb/yard73 lb/yard75 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter51"51"51"
Boiler Pressure200 psi200 psi200 psi
Cylinders (dia x stroke)22" x 28"22" x 28"22" x 28"
Tractive Effort45173 lbs45173 lbs45173 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.87 3.87 3.98
Heating Ability
Firebox Area174.60 sq. ft174.60 sq. ft177 sq. ft
Grate Area57 sq. ft57 sq. ft57 sq. ft
Evaporative Heating Surface3246 sq. ft3292 sq. ft3102 sq. ft
Superheating Surface
Combined Heating Surface3246 sq. ft3292 sq. ft3102 sq. ft
Evaporative Heating Surface/Cylinder Volume263.49267.23251.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation114001140011400
Same as above plus superheater percentage114001140011400
Same as above but substitute firebox area for grate area349203492035400
Power L1568457485502
Power MT286.42289.65269.55


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