Chattanooga Southern / TAG 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 12899)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 16, p. 69. Works numbers were 10869-10870 in May 1890, 11113 in August, and 11806 in April 1891.

In 1910, the Tennessee, Alabama & Georgia emerged from yet another reorganization of the CS and renumbered the three engines 101-103. The TAG Route ran from Chattanooga through Georgia as far south as Gadsden, Alabama, 91.7 timetable miles away.

Locobase isn't sure about the numbering for the 5. It may have spent some time on the Chicago, Kansas City & Texas (later the Kansas City & Atlantic).

NB: Heating surface data is derived from comparison with the Kearney & Black Hills order of the same year, which has identical firebox dimensions as well as identical tube counts, diameters, and length.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12899
RailroadChattanooga Southern / TAG
Number in Class3
Road Numbers1-3, 5 / 101-103
Number Built3
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 8.25'
Engine Wheelbase22.17'
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers50000 lbs
Engine Weight80000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity2800 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)42 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter62"
Boiler Pressure130 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort12362 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area121 sq. ft
Grate Area16.30 sq. ft
Evaporative Heating Surface1181 sq. ft
Superheating Surface
Combined Heating Surface1181 sq. ft
Evaporative Heating Surface/Cylinder Volume187.31
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2119
Same as above plus superheater percentage2119
Same as above but substitute firebox area for grate area15730
Power L13805
Power MT335.54

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