Laurel & Tullahoma Western 4-8-0 "Mastodon" Locomotives of 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).

Specifications 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)16
Engine Wheelbase (ft)26
Ratio of driving wheelbase to overall engine wheebase 0.62
Overall Wheelbase (engine & tender) (ft)56.87
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)153,000
Engine Weight (lbs)187,000
Tender Loaded Weight (lbs)110,000
Total Engine and Tender Weight (lbs)297,000
Tender Water Capacity (gals)5500
Tender Fuel Capacity (oil/coal) (gals/tons)10.50
Minimum weight of rail (calculated) (lb/yd)64
Geometry Relating to Tractive Effort
Driver Diameter (in)56
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)22" x 26"
Tractive Effort (lbs)38,201
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.01
Heating Ability
Firebox Area (sq ft)200
Grate Area (sq ft)33.40
Evaporative Heating Surface (sq ft)3324
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)3324
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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