Laurel & Tullahoma Western 4-8-0 "Mastodon" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 67 (Locobase 13475)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p. 251. See Locobase 12731 for short history of the Eastman Gardiner company. Works number was 36504 in May 1911.

Although Eastman Gardiner specified that as many parts as possible be interchangeable with the 4-6-0 they had bought in 1908 (Locobase 13474), they clearly sought more power. Baldwin responded with a Twelve-wheeler that was of the largest to be built for use on a North American railroad. Compared to the 63, the 67 had a longer wheelbase that accommodated a larger boiler stuffed with more tubes. Moreover, this larger vessel served a larger cylinder volume which was supplied through slide valves actuated by outside radial valve gear. The L & TW had a main line with a maximum curve of 8 degrees, a max gradient of 1 3/4%, and rails weighing 60-lb/yard (30-kg/metre).

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,475
RailroadLaurel & Tullahoma Western
Number in Class1
Road Numbers67
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)16 / 4.88
Engine Wheelbase (ft / m)26 / 7.92
Ratio of driving wheelbase to overall engine wheebase 0.62
Overall Wheelbase (engine & tender) (ft / m)56.87 / 17.33
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)153,000 / 69,400
Engine Weight (lbs / kg)187,000 / 84,822
Tender Loaded Weight (lbs / kg)110,000 / 49,895
Total Engine and Tender Weight (lbs / kg)297,000 / 134,717
Tender Water Capacity (gals / ML)5500 / 20.83
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10.50 / 9.50
Minimum weight of rail (calculated) (lb/yd / kg/m)64 / 32
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)22" x 26" / 559x660
Tractive Effort (lbs / kg)38,201 / 17327.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.01
Heating Ability
Firebox Area (sq ft / m2)200 / 18.58
Grate Area (sq ft / m2)33.40 / 3.10
Evaporative Heating Surface (sq ft / m2)3324 / 308.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3324 / 308.81
Evaporative Heating Surface/Cylinder Volume290.58
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6680
Same as above plus superheater percentage6680
Same as above but substitute firebox area for grate area40,000
Power L17056
Power MT406.69

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Wes Barris