The Baltimore & Ohio's early experiments with the 4-8-2 wheel arrangement included No. 5510 of class T-1, which featured a water-tube firebox, and No. 5550 of class T-2, a near-duplicate with a conventional firebox and boiler. Both were erected in 1930 by the Baldwin Locomotive Works. No. 5550 is shown here at Washington, D.C. on September 10, 1936, with an illuminated smokebox sign proclaiming its service on the B&O's premier train, the Capitol Limited. With 74-inch drivers, this engine had cylinder dimensions of 27½x30 inches and a boiler pressure of 250 p.s.i. Locomotive weight was 385,000 pounds, and tractive effort was 65,150 pounds. The grate area totaled 92 square feet, with an evaporative heating surface of 5489 square feet and a superheating surface of 1365 square feet. No. 5550 remained in service until 1951. There is no information about the photographer, whose work is presented on a postcard acquired from a eBay vendor. The same image appears in the ABPR Archive, uploaded by Bud Laws.