Groveton, Lufkin & Northern 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 15 (Locobase 12897)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 48, p. 259. See also the Tap Line case summaries at, last accessed 20 July 2011. Works number was 40316 in August 1913.

Produced at the same time as the Tremont & Gulf's 25 (Locobase 12895), the 15 was identical except for the adoption of a 200-psi boiler, cylinders with 1" smaller diameters, and drivers 2" taller. The GL & N was a "tap line" built originally by Trinity County Lumber in eastern Texas to improve its logging connections with the Missouri-Kansas-Texas. From Vair to Lufkin the tap line gained trackage rights over the Texas Southeastern, thus reaching both the Houston East & West Texas and the Cotton Belt.

Like many of the other timber lines, the GL & N did not survive the closing of its biggest sawmill customer at Altmar in 1931. The 15 then journeyed across state lines to the T & G, retaining its number.

In 1953, the T & G sold the 15 to Alexandria Gravel's Oden Gravel Company; the 15 was scrapped in December 1964.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,897
RailroadGroveton, Lufkin & Northern
Number in Class1
Road Numbers15
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)12
Engine Wheelbase (ft)23.12
Ratio of driving wheelbase to overall engine wheebase 0.52
Overall Wheelbase (engine & tender) (ft)54.23
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)107,000
Engine Weight (lbs)134,000
Tender Loaded Weight (lbs)100,000
Total Engine and Tender Weight (lbs)234,000
Tender Water Capacity (gals)5000
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)59
Geometry Relating to Tractive Effort
Driver Diameter (in)56
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)18" x 26"
Tractive Effort (lbs)25,573
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Firebox Area (sq ft)152
Grate Area (sq ft)24.30
Evaporative Heating Surface (sq ft)1920
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1920
Evaporative Heating Surface/Cylinder Volume250.73
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4860
Same as above plus superheater percentage4860
Same as above but substitute firebox area for grate area30,400
Power L16533
Power MT403.82

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