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 ID12897
RailroadGroveton, Lufkin & Northern
Number in Class1
Road Numbers15
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase12'
Engine Wheelbase23.12'
Ratio of driving wheelbase to overall engine wheebase 0.52
Overall Wheelbase (engine & tender)54.23'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers107000 lbs
Engine Weight134000 lbs
Tender Light Weight100000 lbs
Total Engine and Tender Weight234000 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)59 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter56"
Boiler Pressure200 psi
Cylinders (dia x stroke)18" x 26"
Tractive Effort25573 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Firebox Area152 sq. ft
Grate Area24.30 sq. ft
Evaporative Heating Surface1920 sq. ft
Superheating Surface
Combined Heating Surface1920 sq. ft
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 area30400
Power L16533
Power MT403.82

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