Following up on the first 31 Pacifics of similar design (Locobase 5716), these batches differed primarily in the size of the cylinders (they were delivered with 22") and installed superheating.
The A & St A B Railway ran from Dothan, Alabama to Panama City, Florida. For such a short line, it had a surprisingly large number of light Pacifics. Alco delivered 46 locomotives to the same design over an 11-year period:
Year No delivered works# road #
1911 5 50143-50147 98-102
1911 12 53892-53903 103-114
1913 6 115-120
1914 6 121-126
1920 10 61762-61271 141-150
1922 7 63260-63267 151-157
The first 10 (works #61762-61271) arrived in 1920, adding 7 more (63260-63267) in 1922.
The tender was also rated at 10 tons of coal.
| Specifications | |
|---|---|
| Class | 98 |
| Locobase ID | 6665 |
| Railroad | Atlanta & St Andrews Bay |
| Whyte | 4-6-2 |
| Road Numbers | 98-126, 141-167 |
| Gauge | Std |
| Builder | Alco |
| Year | 1911 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase | 12.33' |
| Engine Wheelbase | 32.58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.38 |
| Overall Wheelbase (engine & tender) | 60.17' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 129000 lbs |
| Engine Weight | 204000 lbs |
| Tender Light Weight | 162000 lbs |
| Total Engine and Tender Weight | 366000 lbs |
| Tender Water Capacity | 7300 gals |
| Tender Fuel Capacity (oil/coal) | 3500 gals |
| Minimum weight per yard of rail on which locomotive could run | 71.67 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 68" |
| Boiler Pressure | 180 psi |
| Cylinders (dia x stroke) | 22" x 26" |
| Tractive Effort | 28314 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.56 |
| Heating Ability | |
| Firebox Area | 160 sq. ft |
| Grate Area | 47.10 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 | 8478 |
| Same as above plus superheater percentage | 9945.79 |
| Same as above but substitute firebox area for grate area | 33786.13 |
| Power L1 | 12285.46 |
| Power MT | 629.88 |
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