Tionesta Valley / Tombigbee Valley 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 30 (Locobase 13179)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 31, p. See also the Mississippi Rails site at http://www.msrailroads.com/Tombigbee_Valley.htm . Works number was 31843 in October 1907.

Locobase savors the name of one of the two termini on this 52-mile short line, which connected Nannahubba Bluff, Alabama with Healing Springs. The TV emerged in 1904 from the reorganization of the 3-foot-gauge Tombigbee & Northern. Alas, according to Mississippi Rails, it immediately abandoned the segment between Nannahubba Bluff and Calvert.

Its number 30 was bought at the same time and in the same purchase order as the Alabama, Tennessee & Northern's #10 (Locobase 13178). Cost was $9,800.

Five years later the 30 was reunited with the 10 when the AT & N consolidated its lines with the TV.

Class 6 (Locobase 2639)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). Works number was 2981 in June 1898.

Pocket Mogul for a light-rail narrow-gauge line that served the Sheffield, Penn. area.

(Two more Moguls were delivered to the TV as road 7 and 9. One was works number 3562, delivered in July 1900, the other was works number 3956, produced in September 1901. It's likely that they duplicated #6's data, but Locobase can't confirm.)

Specifications by Steve Llanso of Sweat House Media
Locobase ID13,179 2639
RailroadTombigbee ValleyTionesta Valley
Number in Class12
Road Numbers306
Number Built12
BuilderBurnham, Williams & CoBrooks
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)1210
Engine Wheelbase (ft)19.8315.75
Ratio of driving wheelbase to overall engine wheebase 0.61 0.63
Overall Wheelbase (engine & tender) (ft)39.47
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)86,00051,000
Engine Weight (lbs)100,00058,000
Tender Loaded Weight (lbs)80,00050,000
Total Engine and Tender Weight (lbs)180,000108,000
Tender Water Capacity (gals)40002000
Tender Fuel Capacity (oil/coal) (gals/tons)6
Minimum weight of rail (calculated) (lb/yd)4828
Geometry Relating to Tractive Effort
Driver Diameter (in)4838
Boiler Pressure (psi)175165
High Pressure Cylinders (dia x stroke) (in)17" x 24"15" x 18"
Tractive Effort (lbs)21,49414,948
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.00 3.41
Heating Ability
Firebox Area (sq ft)114.8079
Grate Area (sq ft)21.3012.50
Evaporative Heating Surface (sq ft)1328658
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1328658
Evaporative Heating Surface/Cylinder Volume210.63178.73
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation37282063
Same as above plus superheater percentage37282063
Same as above but substitute firebox area for grate area20,09013,035
Power L142232989
Power MT324.77387.62

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