Data from American Locomotive Company, Standardized Locomotives, US Railroad Administration (Alco Pamphlet 10049, 1918), pp. 14-15, reprinted by (Ocean, NJ: Specialty Press , 1973); Eugene L Huddleston, Uncle Sam's Locomotives (Bloomington, IN: Indiana University Press, 2002), pp. 64-65 and 114; and DeGolyer, Volume 58, pp. 23+. See also "Standard Equipment Specialties," Railway Mechanical Engineer, Vol 93, No 3 (March 1919), pp. 137-138 for a list of all the "special equipment" by manufacturers--everything from air brakes to lubricators to rolled steel wheels--and the USRA designs on which they appeared.
Baldwin supplied 45 to five railroads. Alco's Brooks works supplied 70 to six railroads. Alco's Pittsburgh works delivered 30 to six railroads. Lima Locomotive Works produced 30 to five railroads.
Like the rest of the USRA range of standard locomotive designs, these heavt switchers drew from the best of proven switcher design in engines that served as templates for many of the same wheel arrangement over the rest of the steam era. Eight-coupled, all-adhesion switchers may have often reflected USRA qualities, but it's clear that the wheel arrangement diversified much more widely than those based on the USRA 0-6-0s (Locobase 16697).
14" (356 mm) diameter piston valves with a maximum 6 3/4" (171 mm) travel supplied steam to the cylinders. The relatively uncluttered firebox's heating surface area included 18 sq ft (1.67 sq m) in three arch tubes. When fitted for oil-burning, the tenders carried 2,800 US gallons (10,600 litres) of fuel.
Huddleston reported the widely voiced, positive reactions to both these six-coupleds and the eight-coupleds described in Locobase 16698. Most complaints reflected local preference
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 0-8-0 A Heavy Switcher |
| Locobase ID | 16698 |
| Railroad | United States Railroad Administration (USRA) |
| Country | USA |
| Whyte | 0-8-0 |
| Number in Class | 175 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 175 |
| Builder | Several |
| Year | 1918 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15 / 4.57 |
| Engine Wheelbase (ft / m) | 15 / 4.57 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 49.79 / 15.18 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 214,000 / 97,069 |
| Engine Weight (lbs / kg) | 214,000 / 97,069 |
| Tender Loaded Weight (lbs / kg) | 167,900 / 76,158 |
| Total Engine and Tender Weight (lbs / kg) | 381,900 / 173,227 |
| Tender Water Capacity (gals / ML) | 8000 / 30.30 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 16 / 14.50 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 89 / 44.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 175 / 1190 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 25" x 28" / 635x711 |
| Tractive Effort (lbs / kg) | 51,042 / 23152.29 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.19 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 230 - 2" / 51 |
| Flues (number - dia) (in / mm) | 36 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 15 / 4.57 |
| Firebox Area (sq ft / m2) | 208 / 19.32 |
| Grate Area (sq ft / m2) | 47 / 4.37 |
| Evaporative Heating Surface (sq ft / m2) | 2777 / 257.99 |
| Superheating Surface (sq ft / m2) | 614 / 57.04 |
| Combined Heating Surface (sq ft / m2) | 3391 / 315.03 |
| Evaporative Heating Surface/Cylinder Volume | 174.54 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8225 |
| Same as above plus superheater percentage | 9706 |
| Same as above but substitute firebox area for grate area | 42,952 |
| Power L1 | 8735 |
| Power MT | 359.95 |