Bonhomie Southwestern 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 6 (Locobase 15318)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 73, p. 369+. See also the Mississippi Rails' account of the BSW at . Works number was 57671 in March 1924.

Locobase describes the origins of the BSW at Locobase 14308. This Mikado was the largest locomotive on the BSW and was a sister to the 300 on Tatum Lumber Company's other line, the Bonhomie & Hattiesburg Southern (Locobase 15316)..

The 6 was later leased directly to the TLC's B&HS, which renumbered it 301. Shortly after that, however, the 301 was sold in 1940 to the Atlantic & East Carolina, which kept the road number and ran the locomotive for another decade before scrapping it in May 1952.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,318
RailroadBonhomie Southwestern
Number in Class1
Road Numbers6
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.27
Engine Wheelbase (ft / m)30.08 / 9.17
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft / m)57.50 / 17.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)124,000 / 56,246
Engine Weight (lbs / kg)156,000 / 70,760
Tender Loaded Weight (lbs / kg)140,600 / 63,775
Total Engine and Tender Weight (lbs / kg)296,600 / 134,535
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)52 / 26
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)30,685 / 13918.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area (sq ft / m2)162 / 15.05
Grate Area (sq ft / m2)30.75 / 2.86
Evaporative Heating Surface (sq ft / m2)1770 / 164.44
Superheating Surface (sq ft / m2)394 / 36.60
Combined Heating Surface (sq ft / m2)2164 / 201.04
Evaporative Heating Surface/Cylinder Volume207.45
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6150
Same as above plus superheater percentage7257
Same as above but substitute firebox area for grate area38,232
Power L112,445
Power MT885.05

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Wes Barris