Pittsburg, Shawmut & Northern 2-10-2 "Santafe" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 98 (Locobase 5365)

Data from table in June 1907 AERJ. See also "Santa Fe Type Locomotive with Smokebox Superheater", American Engineer and Railroad Journal, , No 3 (March 1907), p. 88-90; and DeGolyer, Volume 29, p. 248. (Thanks to Chris Hohl for his 27 February 2018 email and link to the AERJ article as sources for comments quoted below. He also supplied the superheater area as presented in the AERJ.) Works number was 30000 in January 1907.

Simple-expansion version of the Atchison, Topeka & Santa Fe tandem compounds (Locobases 463 and 11184) that used exactly the same boiler and firebox. Chris Hohl notes that Baldwin's spec for the 98 showed a high 225 psi (15.5 bar) setting for the boiler; this is clearly an artifact of the design's origin as a tandem compound. Further investigation shows that the same specification's calculated tractive effort of 59,840 lb agrees with the 160 psi figure given in the AERJ story.

See Locobases 4208 and 11454 for descriptions of Baldwin's smokebox superheater. The lower-temperature design meant the locomotive could still use slide valves.

The PS&N (using Pittsburg without the "H") was a Western New York railroad that ran down into Pennsylvania. The Baldwin specs note that between Readville and Payne, Pa, there were twelve miles of road that had compensated curve radii of 12 degrees on the main and 14 deg on the Ys.

The engine had a relatively short career before being scrapped in April 1930.

Principal Dimensions by Steve Llanso of Sweat House Media
Class98
Locobase ID5365
RailroadPittsburg, Shawmut & Northern
CountryUSA
Whyte2-10-2
Number in Class1
Road Numbers98
GaugeStd
Number Built1
BuilderBurnham, Williams & Co
Year1907
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.75 / 6.02
Engine Wheelbase (ft / m)35.92 / 10.95
Ratio of driving wheelbase to overall engine wheebase 0.55
Overall Wheelbase (engine & tender) (ft / m)67.37 / 20.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)235,000 / 106,594
Engine Weight (lbs / kg)288,000 / 130,635
Tender Loaded Weight (lbs / kg)162,000 / 73,482
Total Engine and Tender Weight (lbs / kg)450,000 / 204,117
Tender Water Capacity (gals / ML)8500 / 32.20
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)78 / 39
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)160 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)28" x 32" / 711x813
Tractive Effort (lbs / kg)59,859 / 27151.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area (sq ft / m2)210 / 19.52
Grate Area (sq ft / m2)58.50 / 5.44
Evaporative Heating Surface (sq ft / m2)4796 / 445.72
Superheating Surface (sq ft / m2)762
Combined Heating Surface (sq ft / m2)5558 / 445.72
Evaporative Heating Surface/Cylinder Volume210.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9360
Same as above plus superheater percentage10,670
Same as above but substitute firebox area for grate area38,304
Power L18467
Power MT397.16

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