Data from SP&S 2 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
Originally delivered to the SP & S as redirected E-14 Ten-wheelers from the Great Northern (one of two SP & S owners), these engines underwent signficant changes in the 1920s. The design followed that of the Great Northern's H-5/H-7 rebuild (Locobase 6450). Total heating surface in the boiler remained about the same, but the percentage of superheater area rose considerably. Also, the boiler was lengthened by 42" and the Belpaire firebox gained a combustion chamber.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | H-1 |
| Locobase ID | 8846 |
| Railroad | Spokane, Portland & Seattle |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | 6 |
| Road Numbers | 620-625 |
| Gauge | Std |
| Number Built | |
| Builder | Hillyard |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 36.96 / 11.27 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 75.11 / 22.89 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 55,500 / 25,174 |
| Weight on Drivers (lbs / kg) | 166,500 / 75,523 |
| Engine Weight (lbs / kg) | 283,400 / 128,548 |
| Tender Loaded Weight (lbs / kg) | 252,700 / 114,623 |
| Total Engine and Tender Weight (lbs / kg) | 536,100 / 243,171 |
| Tender Water Capacity (gals / ML) | 18,000 / 68.18 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4950 / 18,736 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 93 / 46.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 73 / 1854 |
| Boiler Pressure (psi / kPa) | 210 / 1450 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23.5" x 30" / 597x762 |
| Tractive Effort (lbs / kg) | 40,511 / 18375.50 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.11 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 155 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 32 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 21 / 6.40 |
| Firebox Area (sq ft / m2) | 272 / 25.27 |
| Grate Area (sq ft / m2) | 55 / 5.11 |
| Evaporative Heating Surface (sq ft / m2) | 3157 / 293.40 |
| Superheating Surface (sq ft / m2) | 774 / 71.93 |
| Combined Heating Surface (sq ft / m2) | 3931 / 365.33 |
| Evaporative Heating Surface/Cylinder Volume | 209.63 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 11,550 |
| Same as above plus superheater percentage | 13,860 |
| Same as above but substitute firebox area for grate area | 68,544 |
| Power L1 | 19,481 |
| Power MT | 773.84 |