The B&O's terminal at Riverdale, Illinois, just south of Chicago, is the scene for this imposing color view of class T-3 4-8-2 No. 5556. The transparency, by an unknown photographer, was taken on September 24, 1955 and comes to our collection via Edward Lorence. The B&O's Mount Clare Shops in Baltimore erected No. 5556 in 1942, this locomotive being only the second in a group of 40 Mountain types built from 1942-1948 using boilers from retired Pacifics and Mikados (this engine being rebuilt from 2-8-2 No. 4011). Originally these first T-3s had a Vanderbilt tender holding 15,000 gallons of water and 26 tons of coal. Beginning in 1956, a year after this image was captured, all remaining T-3s were renumbered in the 700 series to make room for new diesels, but No. 5556 was retired before the renumbering. For dimensions of the T-3 class consult the commentary for No. 5584 (725) following.