Abilene & Southern 2-8-2 "Mikado" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 16156)

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
Class20
Locobase ID16156
RailroadAbilene & Southern
CountryUSA
Whyte2-8-2
Number in Class1
Road Numbers20
GaugeStd
Number Built1
BuilderAlco-Schenectady
Year1926
Valve GearWalschaert
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 Volume212.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8300
Same as above plus superheater percentage9960
Same as above but substitute firebox area for grate area33,840
Power L114,358
Power MT937.89

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