Ralph Graves snapped this photo of Chicago, Indianapolis & Louisville 2-8-2 No. 578 at Lafayette, Indiana on May 1, 1947. The American Locomotive Company delivered the J-4 class, the Monon's final and most powerful group of Mikados, in 1929. With 63-inch drivers, they had 27x32-inch cylinders and carried a boiler pressure of 220 p.s.i. They developed 69,243 pounds of tractive force and weighed 555,000 pounds. Their evaporative heating surface totaled 4319 square feet and their superheater surface 1166 square feet, and they had 80 square feet of grate area. Being one of the earliest railroads to completely dieselize, the Monon was able to sell some of its steam locomotives to other lines; No. 578 went to the Tennessee, Alabama & Georgia in 1948 as its No. 402, but was scrapped by 1951.