Data from Negative 7758, Degolyer Library collection of digitized Baldwin images, retrieved 26 October 2010 from [] . See also DeGolyer, Volume 65, pp. 1+. (Thanks to Chris Hohl for his 4 November 2016 email noting the error (52" instead of 57") in the 18's driver diameter.) Works number was 54089 in November 1920.
This small, freight-drivered Ten-wheeler enjoyed a good measure of superheat, which also necessitated piston valves (9 1/2"/241 mm in diameter) for steam admission to the cylinders. It never strayed off the A & S rails, serving the line until its retirement in June 1947.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 18 |
| Locobase ID | 11724 |
| Railroad | Abilene & Southern |
| Country | USA |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 18 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.33 / 3.45 |
| Engine Wheelbase (ft / m) | 21.58 / 6.58 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.53 |
| Overall Wheelbase (engine & tender) (ft / m) | 51.17 / 15.60 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 94,000 / 42,638 |
| Engine Weight (lbs / kg) | 126,000 / 57,153 |
| Tender Loaded Weight (lbs / kg) | 100,000 / 45,359 |
| Total Engine and Tender Weight (lbs / kg) | 226,000 / 102,512 |
| Tender Water Capacity (gals / ML) | 5000 / 18.94 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10 / 9 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1321 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 22,032 / 9993.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 131 - 2" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 12.50 / 3.81 |
| Firebox Area (sq ft / m2) | 108 / 10.04 |
| Grate Area (sq ft / m2) | 22.30 / 2.07 |
| Evaporative Heating Surface (sq ft / m2) | 1327 / 123.33 |
| Superheating Surface (sq ft / m2) | 312 / 29 |
| Combined Heating Surface (sq ft / m2) | 1639 / 152.33 |
| Evaporative Heating Surface/Cylinder Volume | 187.69 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4237 |
| Same as above plus superheater percentage | 5042 |
| Same as above but substitute firebox area for grate area | 24,419 |
| Power L1 | 11,935 |
| Power MT | 839.75 |