Houston County 2-8-2 "Mikado" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 14144)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 48, p. 245. Works number was 39933 in June 1913.

This small logging Mikado was ordered by the Louisiana & Texas Lumber Company for its Texas operation. It was intended to negotiate 230 ft/70 metre (25 degrees radii) curves

The 7 later operated on Delta Land & Timber's Missouri & Louisiana, which was later renamed the Neame, Carson & Southern. The NC&S sold the 7 in 1927 to Kirby Lumber, which renumbered it 94.

Specifications by Steve Llanso of Sweat House Media
Class7
Locobase ID14,144
RailroadHouston County
CountryUSA
Whyte2-8-2
Number in Class1
Road Numbers7
GaugeStd
Number Built1
BuilderBaldwin
Year1913
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.25 / 3.73
Engine Wheelbase (ft / m)27.50 / 8.38
Ratio of driving wheelbase to overall engine wheebase 0.45
Overall Wheelbase (engine & tender) (ft / m)52.37 / 15.96
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)96,000 / 43,545
Engine Weight (lbs / kg)121,000 / 54,885
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)201,000 / 91,172
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd)40
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)23,070 / 10464.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Firebox Area (sq ft / m2)101 / 9.38
Grate Area (sq ft / m2)22.20 / 2.06
Evaporative Heating Surface (sq ft / m2)1485 / 137.96
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1485 / 137.96
Evaporative Heating Surface/Cylinder Volume235.53
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3996
Same as above plus superheater percentage3996
Same as above but substitute firebox area for grate area18,180
Power L14356
Power MT400.14