The Central of Georgia Railway operated two classes of "Pacifics" for over 40 years. The first of these classes was designated as Class P-1 and consisted of 15 light weight 4-6-2 locomotives. These locomotives were assigned road numbers 1614 through 1628 (later renumbered 414 through 428) and were delivered from the Baldwin Locomotive Works during 1905 and 1906. They had 21 x 28 cylinders, 68" drivers, a 200 psi boiler pressure, exerted 30,870 lbs of tractive effort and each weighed 192,500 pounds.

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.