Chattanooga Southern / TAG 4-4-0 "American" Locomotives in 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 Volume 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 (Locobase 11697) of the same year, which has identical firebox dimensions as well as identical tube counts, diameters, and length--as did several other orders such as the Windsor & Annapolis's Kentville (Locobase 15657) a year later.

Principal Dimensions 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 (ft / m) 8.25 / 2.51
Engine Wheelbase (ft / m)22.17 / 6.76
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)50,000 / 22,680
Engine Weight (lbs / kg)80,000 / 36,287
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2800 / 10.61
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 1575
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)12,362 / 5607.32
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Tubes (number - dia) (in / mm)188 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.92 / 3.33
Firebox Area (sq ft / m2)121 / 11.25
Grate Area (sq ft / m2)16.30 / 1.51
Evaporative Heating Surface (sq ft / m2)1181 / 109.76
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1181 / 109.76
Evaporative Heating Surface/Cylinder Volume187.16
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 area15,730
Power L13802
Power MT335.28

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Wes Barris