Lehigh Valley 4-8-4 No. 5101 was selected for this Baldwin Locomotive Works builder's photo of the T-1a class delivered in 1932. Intended for heavy freight service, these locomotives had 70-inch drivers and a boiler pressure of 250 p.s.i., with cylinder dimensions of 27x30 inches. They weighed 413,170 pounds and produced 66,391 pounds of tractive effort. Their grate area measured 88 square feet, and they had 5422 square feet of evaporative heating surface plus 2256 square feet of superheater surface. As built, The T-1a group had an unusual tender trailing-truck booster that added 18,630 pounds of tractive effort.