Texas Southern 4-6-0 "Ten-Wheeler" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 56 (Locobase 12756)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 27, p. 199. See also Nancy Beck Young, "TEXAS SOUTHERN RAILWAY," Handbook of Texas Online ([]), accessed June 23, 2011. Published by the Texas State Historical Association. Works numbers were 25211, 25244 in March 1905.

Two of many light-footed Ten-wheelers produced at this time, this pair for an east Texas line that succeeded to the assets of the bankrupt Paris, Marshall & Sabine Pass in 1897. It was dependent on logging demand and never found firm foundation in other business lines. Its assets were bought up by the Marshall & East Texas in 1908, but that group had little better success and rolled up in the mid-teens.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID12,756
RailroadTexas Southern
Number in Class2
Road Numbers56-57
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)25.17 / 7.67
Ratio of driving wheelbase to overall engine wheebase 0.60
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)88,500 / 40,143
Engine Weight (lbs / kg)116,000 / 52,617
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)196,000 / 88,904
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)20,872 / 9467.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.24
Heating Ability
Firebox Area (sq ft / m2)122.70 / 11.40
Grate Area (sq ft / m2)22 / 2.04
Evaporative Heating Surface (sq ft / m2)1567 / 145.63
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1567 / 145.63
Evaporative Heating Surface/Cylinder Volume221.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3960
Same as above plus superheater percentage3960
Same as above but substitute firebox area for grate area22,086
Power L15275
Power MT394.22

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