After the Central of Georgia came under the control of the Illinois Central Railroad in 1909, tracks and bridges were strengthened which made it possible for the railroad to use heavier locomotives. Beginning in 1912, heavier "Pacifics" designated as Class P-2 started to arrive. There were ten, road numbers 1651 through 1660 (later renumbered 431 through 440) delivered from Baldwin in 1912 and 1913 and four, road numbers 1661 through 1664 (later renumbered 441 through 444) built by the Lima Locomotive Works and delivered in 1916. These locomotives had 23 x 28 cylinders, 69" drivers, a 200 psi boiler pressure, exerted 36,493 lbs of tractive effort and each weighed 222,300 pounds.
Two Class P-1 locomotives, numbers 419 and 425, were destroyed on July 23, 1936 as a result of a head on collision between the two passenger trains they were leading. The rest of the Class P-1 and Class P-2 "Pacifics" were retired beginning in the late 1940's and all were scrapped by 1952.
Drury (1993) describes these as "typical early Pacifics" that had slide valves and inside bearings. The diagram book shows the superheated upgrade (Locobase 4227). Most received 12" piston valves.
They lasted throughout the steam era, the first being retired in 1939, the last in 1952.
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.
Drury (1993) comments that despite the higher weight these engines were still light Pacifics. Still, these P-2s had much bigger grates and larger cylinders (and superheaters when delivered) than the P-1s they joined on the C of Ga (Locobase 7938). Firebox heating surface included a short Gaines half-wall combustion chamber that subdivided the 132" (3.35 m) length of the firebox. The grate area was figured on the 88" (2.235 m) on the back side of the Gaines wall.
Some time after the Lima quartet was delivered to fill out the P-2 stud in 1916 (Locobase 4228), all of the engines were updated beginning in the late 1920s or early 1930s with more grate area and firebox heating surface area. It now included 13.3 sq ft (1.25 sq m) of arch tubes and 53 sq ft (4.9 sq m) of syphons. Tube count decreased by 12 while adhesion weight rose by over four tons.
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 ...).
|Specifications by Steve Llanso of Sweat House Media|
|Class||P-1||P-1 - superheated||P-2||P-2 - syphons|
|Railroad||Central of Georgia (CofGa)||Central of Georgia (CofGa)||Central of Georgia (CofGa)||Central of Georgia (CofGa)|
|Number in Class||15||15||14||15|
|Road Numbers||1614-1628 / 414-428||1614-1628||1651-1664 / 431-444||1651-1664|
|Builder||Burnham, Williams & Co||C of Ga||several||Lima|
|Locomotive Length and Weight|
|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 of rail (calculated)||63 lb/yard||65 lb/yard||75 lb/yard||80 lb/yard|
|Geometry Relating to Tractive Effort|
|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|
|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 sq. ft||2414 sq. ft||2751 sq. ft||2834 sq. ft|
|Superheating Surface||531 sq. ft||605 sq. ft||599 sq. ft|
|Combined Heating Surface||3386 sq. ft||2945 sq. ft||3356 sq. ft||3433 sq. ft|
|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||11045||11977||15444|
|Same as above but substitute firebox area for grate area||39400||46492||38468||56371|