On land and by sea: Greenbrier Companies' recipe for growth involves the manufacturing of freight cars and marine barges. Through its primary Manufacturing segment, Greenbrier produces 100-ton-capacity boxcars; intermodal and conventional railcars; center-partition, flat, and tank cars; and marine vessels. Its Wheels & Parts segment repairs and services wheels and offers railcar refurbishment and parts in nearly 30 locations. Its Leasing & Services unit manages a fleet of about 8,900 railcars. Alan James and William Furman founded The Greenbrier Companies in 1981.