The Central of Georgia's 1927 locomotive diagram book, supplied in May 2005 by Allen Stanley from his extensive collection, shows the superheated upgrade (Locobase 4227). Most received 12" piston valves.
When the C of Ga superheated its slide-valve, Stephenson-motion Pacifics (Locobase 7938), they transacted the usual trade-off between boiler tubes and superheater flues. Unlike many such Pacific overhauls, the resulting heating surface total dropped considerably because of the small diameter of the boiler. Most received 12" piston valves.
Although Drury (1993) comments that despite the higher weight these engines were still light Pacifics, they had much bigger grates and larger cylinders (and superheaters when delivered) than the P-1s they joined on the C of Ga. 10 came from Baldwin in 1912, 4 more from Lima in 1916.
Most ran to the end of steam in the early 1950s, although at least one engine was scrapped in 1935. (Likely a casualty of some accident ...)
It's interesting to see what a difference a couple of years and a switch of builders can mean to a basic layout. Locobase 4228 shows the Baldwins from 1910. The Limas in the current entry are grouped in that class, but the grate area is considerably larger.
According to the later editions of Central of Georgia books, the earlier Baldwins were later modified to the dimensions shown in this entry. By this time, firebox heating surface included 13.3 sq ft of arch tubes and 53 sq ft of syphons.
Most ran to the end of steam in the early 1950s.
| Specifications | ||||
|---|---|---|---|---|
| Class | P-1 | P-1 - superheated | P-2 - BLW | P-2 - Lima |
| Locobase ID | 7938 | 4227 | 4228 | 6677 |
| Railroad | Central of Georgia | Central of Georgia | Central of Georgia | Central of Georgia |
| Whyte | 4-6-2 | 4-6-2 | 4-6-2 | 4-6-2 |
| Road Numbers | 1614-1628 | 1614-1628 | 1651-1660 / 431-440 | 1661-1664 / 441-444 |
| Gauge | Std | Std | Std | Std |
| Builder | Burnham, Williams & Co | shops | Baldwin | Lima |
| Year | 1905 | 1924 | 1912 | 1916 |
| Valve Gear | Stephenson | Stephenson | Walschaert | Walschaert |
| Locomotive Length and Weight | ||||
| Driver Wheelbase | 11.83' | 11.83' | 12' | 12' |
| Engine Wheelbase | 30.37' | 30.37' | 31.50' | 31' |
| Ratio of driving wheelbase to overall engine wheebase | 0.39 | 0.39 | 0.38 | 0.39 |
| Overall Wheelbase (engine & tender) | 57.96' | 64.87' | 64.87' | |
| Axle Loading (Maximum Weight per Axle) | 44530 lbs | |||
| Weight on Drivers | 113660 lbs | 117000 lbs | 134850 lbs | 143200 lbs |
| Engine Weight | 187560 lbs | 192500 lbs | 222300 lbs | 230500 lbs |
| Tender Light Weight | 150000 lbs | 150000 lbs | 150000 lbs | 151000 lbs |
| Total Engine and Tender Weight | 337560 lbs | 342500 lbs | 372300 lbs | 381500 lbs |
| Tender Water Capacity | 7500 gals | 7500 gals | 7500 gals | 7500 gals |
| Tender Fuel Capacity (oil/coal) | 12.5 tons | 12.5 tons | 13 tons | 13 tons |
| Minimum weight per yard of rail on which locomotive could run | 63.14 lb rail | 65 lb rail | 74.92 lb rail | 79.56 lb rail |
| Geometry Relating to Tractive Effort | ||||
| Driver Diameter | 68" | 68" | 69" | 69" |
| Boiler Pressure | 200 psi | 200 psi | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 21" x 28" | 21" x 28" | 23" x 28" | 23" x 28" |
| Tractive Effort | 30870 lbs | 30870 lbs | 36493 lbs | 36493 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.68 | 3.79 | 3.70 | 3.92 |
| Heating Ability | ||||
| Firebox Area | 197 sq. ft | 197 sq. ft | 163 sq. ft | 240.90 sq. ft |
| Grate Area | 46.80 sq. ft | 46.80 sq. ft | 50.75 sq. ft | 66 sq. ft |
| Evaporative Heating Surface | 3386 | 2414 | 2751 | 2834 |
| Superheating Surface | 531 | 605 | 599 | |
| Combined Heating Surface | 3386 | 2945 | 3356 | 3433 |
| Evaporative Heating Surface/Cylinder Volume | 301.66 | 215.06 | 204.32 | 210.48 |
| Computations Relating to Power Output (More Information) | ||||
| Robert LeMassena's Power Computation | 9360 | 9360 | 10150 | 13200 |
| Same as above plus superheater percentage | 9360 | 11047.66 | 11979.78 | 15503.18 |
| Same as above but substitute firebox area for grate area | 39400 | 46504.04 | 38476.94 | 56586.59 |
| Power L1 | 8826.65 | 16514.37 | 15392.56 | 16107.45 |
| Power MT | 513.62 | 933.54 | 754.94 | 743.94 |
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