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; "Simple Engine for the PS&N", Railway and Locomotive Engineering, Volume 20, No 4 (April 1907), pp. 150 (diagram), 151-152; 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. Equalization was split between the pony truck and the first two drivers and the fourth and fifth drivers equalized with the trailing truck. The Rushton trailing truck used a self-centering device that "brings the truck back to normal after rounding a curve." The third set, driven by the main rod, were flangeless. Fuel and water rode in a Vanderbilt-design cylindrical tender.
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 98 had a relatively short career before being scrapped in April 1930.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 98 |
| Locobase ID | 5365 |
| Railroad | Pittsburg, Shawmut & Northern |
| Country | USA |
| Whyte | 2-10-2 |
| Number in Class | 1 |
| Road Numbers | 98 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1907 |
| Valve Gear | Walschaert |
| 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 wheelbase | 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 / Liters/MT) | 14 / 13 |
| 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 / 1450 |
| 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 | |
| Tubes (number - dia) (in / mm) | 391 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 20 / 6.10 |
| 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 Volume | 210.26 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9360 |
| Same as above plus superheater percentage | 10,670 |
| Same as above but substitute firebox area for grate area | 38,304 |
| Power L1 | 8466 |
| Power MT | 397.11 |
