Atlanta & Charlotte Air Line 0-4-4 "Forney" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Tallulah (Locobase 11762)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 9, p. 221. Baldwin works number was 4909 in December 1879.

Adhesion-first tank engines came in two sizes: small, for industrial, lumber, or narrow-gauge use, or larger, main-line engines for local passenger traffiic. The 27 was one of the latter.

The A & C Air Line represented an amalgamation of several Georgia and North Carolina "air lines". Its 268 miles embodied (in order of original incorporation or charter): Georgia Air Line Railroad and Air Line Railroad Company in South Carolina, which were consolidated in 1870 to form the Atlanta & Richmond Air-Line Railway, which was foreclosed in 1876 and distributed to purchasers in Georgia, North Carolina, and South Carolina as their respective Air-Line Companies.

At the very end of December 1879, the Richmond & Danville began operating the A & C property and ran it until the Southern took over the bankrupt R & D in 1894. The 27 followed the ownership and was eventually renumbered 1315 by the Southern.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,762
RailroadAtlanta & Charlotte Air Line (SRS)
Number in Class1
Road Numbers27 / 1315
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)21.04 / 6.41
Ratio of driving wheelbase to overall engine wheebase 0.33
Overall Wheelbase (engine & tender) (ft / m)21.04 / 6.41
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)14,144 / 6415.62
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)82 / 7.62
Grate Area (sq ft / m2)13.90 / 1.29
Evaporative Heating Surface (sq ft / m2)777 / 72.21
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)777 / 72.21
Evaporative Heating Surface/Cylinder Volume139.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1807
Same as above plus superheater percentage1807
Same as above but substitute firebox area for grate area10,660
Power L12210
Power MT

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Wes Barris