When orginally sold to the Florida East Coast railroad, these Pacifics had saturated boilers as shown in Locobase 5716. Several years before they were sold to the AB & C, the class was superheated (Locobase 3138). Then the class was sold to the AB & C.
Most remained relatively unchanged, but the 79 (works# 53908) was streamlined in December 1940 to head up the Dixie Flagler with the results as shown here. Very little on the locomotive was changed, but a skyline casing was added as well as a bullet-tipped smokebox cover. Also, the tender grew considerably and now weighed 210,500 lb when loaded with 11,000 gallons of water and 18 tons of coal.
| Specifications | |
|---|---|
| Class | 71 |
| Locobase ID | 7609 |
| Railroad | Atlanta, Birmingham & Atlantic (AB&C) |
| Whyte | 4-6-2 |
| Road Numbers | 79 |
| Gauge | Std |
| Builder | Alco |
| Year | 1913 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 12.33' |
| Engine Wheelbase | 23.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.53 |
| Overall Wheelbase (engine & tender) | 73.50' |
| Axle Loading (Maximum Weight per Axle) | 44200 lbs |
| Weight on Drivers | 132600 lbs |
| Engine Weight | 208500 lbs |
| Tender Light Weight | 210500 lbs |
| Total Engine and Tender Weight | 419000 lbs |
| Tender Water Capacity | 11000 gals |
| Tender Fuel Capacity (oil/coal) | 18 tons |
| Minimum weight per yard of rail on which locomotive could run | 73.67 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 69" |
| Boiler Pressure | 210 psi |
| Cylinders (dia x stroke) | 22" x 26" |
| Tractive Effort | 32554 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.07 |
| Heating Ability | |
| Firebox Area | 160 sq. ft |
| Grate Area | 46.90 sq. ft |
| Evaporative Heating Surface | 2111 |
| Superheating Surface | 442 |
| Combined Heating Surface | 2553 |
| Evaporative Heating Surface/Cylinder Volume | 184.54 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9849 |
| Same as above plus superheater percentage | 11554.15 |
| Same as above but substitute firebox area for grate area | 39417.16 |
| Power L1 | 14543.82 |
| Power MT | 725.42 |
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