Alton No. 5280 belonged to class P-15. Alco's Brooks Works outshopped these Pacifics in 1910 as the Chicago & Alton's class I-5A, numbered 625-634. They had 77-inch drivers and 23x28-inch cylinders, and sustained 200 pounds of boiler pressure. With a locomotive weight of 220,000 pounds they exerted a tractive effort of 32,800 pounds. This photo was provided by Gary Thompson of Normal, Illinois and was probably taken by Walter A. Peters.