Amasa Stone, Jr. (April 27, 1818 – May 11, 1883) was an American industrialist who is best remembered for having created a regional railroad empire centered in the U.S. state of Ohio from 1860 to 1883. He gained fame in New England in the 1840s for building hundreds of bridges, most of them Howe truss bridges (the patent for which he had licensed from its inventor). After moving into railroad construction in 1848, Stone moved to Cleveland, Ohio, in 1850. Within four years he was a director of the Cleveland, Columbus and Cincinnati Railroad and the Cleveland, Painesville and Ashtabula Railroad. The latter merged with the Lake Shore and Michigan Southern Railway, of which Stone was appointed director. Stone was also a director or president of numerous railroads in Ohio, New York, Pennsylvani