Groveton, Lufkin & Northern 4-6-0 "Ten-Wheeler" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)23.12 / 7.05
Ratio of driving wheelbase to overall engine wheelbase 0.52
Overall Wheelbase (engine & tender) (ft / m)54.23 / 16.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)107,000 / 48,534
Engine Weight (lbs / kg)134,000 / 60,781
Tender Loaded Weight (lbs / kg)100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)234,000 / 106,140
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660
Tractive Effort (lbs / kg)25,573 / 11599.73
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Tubes (number - dia) (in / mm)228 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.25 / 4.04
Firebox Area (sq ft / m2)152 / 14.13
Grate Area (sq ft / m2)24.30 / 2.26
Evaporative Heating Surface (sq ft / m2)1920 / 178.44
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1920 / 178.44
Evaporative Heating Surface/Cylinder Volume250.65
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 L16531
Power MT403.69

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