Arizona Lumber & Timber 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 11016)

Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 28-29. See also DeGolyer, Volume 52, pp. 380+. (Thanks to Chris Hohl for a 31 March 2015 email questioning the ownership of this locomotive that led to a clarification of its operating history.) Works number was 43561 in June 1916.

Delivered to the Arizona Lumber Company in Flagstaff, Ariz, this medium-sized Mikado had a tough assignment, but at least the profile seemed reasonable. The AL&T's Central Arizona Railway had 25 miles (40.25 km) of 56 lb/yard (28 kg/metre) track, maximum grades of 3% on spurs and average grades of 1 1/2% to 2% and 20 degree curves. According to the specs, the 1 typically would "run 20 miles [32 km] in forward motion, then turn and run in backward motion from 3 to 8 miles [4.8-12.9 km] each trip, and will make two trips in ten hours, or say 110 miles [177 km] in ten hours."

But the 1 proved too heavy for the line, so ALC returned it and Baldwin sold it to the Saint Louis, Troy & Eastern. (See Locobase 12512 for a short description of the SLT&E.)

By 1928, it had been sold to locomotive rebuilder Georgia Car & Locomotive, which then sold it back to the Illinois Terminal, with which the SLT & E had merged in 1925.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,016
RailroadArizona Lumber & Timber
Number in Class1
Road Numbers1
Number Built1
Valve GearSouthern
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.96
Engine Wheelbase (ft / m)27.83 / 8.48
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft / m)58.50 / 17.83
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)134,600 / 61,054
Engine Weight (lbs / kg)174,000 / 78,925
Tender Loaded Weight (lbs / kg)111,000 / 50,349
Total Engine and Tender Weight (lbs / kg)285,000 / 129,274
Tender Water Capacity (gals / ML)5500 / 20.83
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2000 / 7.60
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)20" x 28" / 508x711
Tractive Effort (lbs / kg)33,717 / 15293.79
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99
Heating Ability
Firebox Area (sq ft / m2)158 / 14.68
Grate Area (sq ft / m2)41.30 / 3.84
Evaporative Heating Surface (sq ft / m2)3166 / 294.13
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3166 / 294.13
Evaporative Heating Surface/Cylinder Volume310.97
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7021
Same as above plus superheater percentage7021
Same as above but substitute firebox area for grate area26,860
Power L15284
Power MT346.19

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Wes Barris