Temple Lumber Company 2-8-2 "Mikado" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 18 (Locobase 13853)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University C-7626 as archived at The History Center of Diboll, Texas at http://www.thehistorycenteronline.com/documents/digitalresources/engine_18_baldwin_specifications.pdf, last accessed 12 February 2012. DeGolyer, Vol 71, pp. 402+. Works number was 55382 in May 1922.

Locobase recommends reviewing the full specification to see what Baldwin described as standard practice in terms of materials, procedures, techniques in the mid-1920s - fascinating. See also Locobase 13855 for a superheated variant that arrived about 8 years later.


Class 20 (Locobase 13854)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University 30 D 23 as archived at The History Center of Diboll, Texas at http://www.thehistorycenteronline.com/documents/digitalresources/engine_18_baldwin_specifications.pdf, last accessed 12 February 2012. See also DeGolyer, Vol 80, pp. 433+. Works number was 61193 in December 1929.

Locobase recommends reviewing the spec to see what Baldwin described as standard practice in terms of materials, procedures, techniques in building a logging Mikado in the late-1920s. Even though this was quite a bit larger than most logging 2-8-2s, the 20's construction had specifically to meet both State of Texas regulations and the American Logging and Sawmill Safety Code.

The relatively generous amount of superheat dictated piston valves, so the 20's cylinders were served by piston valves measuring 10" (254 mm) in diameter.

See also Locobase 13854 for a saturated predecessor that arrived in 1922.

Specifications by Steve Llanso of Sweat House Media
Class1820
Locobase ID13,853 13,854
RailroadTemple Lumber CompanyTemple Lumber Company
CountryUSAUSA
Whyte2-8-22-8-2
Number in Class11
Road Numbers1820
GaugeStdStd
Number Built11
BuilderBaldwinBaldwin
Year19221929
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.25 / 3.7315.25 / 4.65
Engine Wheelbase (ft / m)27.50 / 8.3831.33 / 9.55
Ratio of driving wheelbase to overall engine wheebase 0.45 0.49
Overall Wheelbase (engine & tender) (ft / m)53.21 / 16.2266.54 / 20.28
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)99,150 / 44,974137,640 / 62,433
Engine Weight (lbs / kg)126,150 / 57,221191,600 / 86,908
Tender Loaded Weight (lbs / kg)91,200 / 41,368131,660 / 59,720
Total Engine and Tender Weight (lbs / kg)217,350 / 98,589323,260 / 146,628
Tender Water Capacity (gals / ML)4500 / 17.056000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1200 / 4.502500 / 9.50
Minimum weight of rail (calculated) (lb/yd)4157
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 111856 / 1422
Boiler Pressure (psi / kPa)175 / 12.10200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x61020" x 28" / 508x711
Tractive Effort (lbs / kg)23,448 / 10635.8534,000 / 15422.16
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.23 4.05
Heating Ability
Firebox Area (sq ft / m2)105 / 9.75148 / 13.75
Grate Area (sq ft / m2)22.20 / 2.0641.50 / 3.86
Evaporative Heating Surface (sq ft / m2)1490 / 138.422466 / 229.10
Superheating Surface (sq ft / m2)603 / 56.02
Combined Heating Surface (sq ft / m2)1490 / 138.423069 / 285.12
Evaporative Heating Surface/Cylinder Volume236.32242.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation38858300
Same as above plus superheater percentage38859960
Same as above but substitute firebox area for grate area18,37535,520
Power L1410115,828
Power MT364.751014.09