Data from T&P 1 - 1951ca Locomotive Diagrams Combined supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works number was 67102 in September 1926.
One of only two locomotives purchased new by the A&S, this small Mikado had generous amounts of heating surface area, 11" (279 mm) piston valves to admit the dry steam into the cylinders, and low drivers to generate good starting tractive effort.
The 20 enjoyed a long career. It put in almost 25 years of steady service on the A&S. In 1950, that railroad converted to diesel power and the 20 moved over to the Texas & Pacific, which operated it out of Alexandria, La until its retirement in February 1953. The Louisiana Eastern bought the 20 in October 1953 and renumbered it three times (5, 13, and 11) before its scrapping in 1962.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 20 |
Locobase ID | 16156 |
Railroad | Abilene & Southern |
Country | USA |
Whyte | 2-8-2 |
Number in Class | 1 |
Road Numbers | 20 |
Gauge | Std |
Number Built | 1 |
Builder | Alco-Schenectady |
Year | 1926 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 15 / 4.57 |
Engine Wheelbase (ft / m) | 31.08 / 9.47 |
Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
Overall Wheelbase (engine & tender) (ft / m) | 60.08 / 18.31 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 135,000 / 61,235 |
Engine Weight (lbs / kg) | 175,000 / 79,379 |
Tender Loaded Weight (lbs / kg) | 124,521 / 56,482 |
Total Engine and Tender Weight (lbs / kg) | 299,521 / 135,861 |
Tender Water Capacity (gals / ML) | 6000 / 22.73 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2584 / 9780 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 56 / 28 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 56 / 1422 |
Boiler Pressure (psi / kPa) | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 28" / 508x711 |
Tractive Effort (lbs / kg) | 34,000 / 15422.16 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.97 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 140 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 24 - 5.375" / 137 |
Flue/Tube length (ft / m) | 19 / 5.79 |
Firebox Area (sq ft / m2) | 141 / 13.10 |
Grate Area (sq ft / m2) | 41.50 / 3.86 |
Evaporative Heating Surface (sq ft / m2) | 2166 / 201.30 |
Superheating Surface (sq ft / m2) | 551 / 51.21 |
Combined Heating Surface (sq ft / m2) | 2717 / 252.51 |
Evaporative Heating Surface/Cylinder Volume | 212.77 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 8300 |
Same as above plus superheater percentage | 9960 |
Same as above but substitute firebox area for grate area | 33,840 |
Power L1 | 14,358 |
Power MT | 937.89 |