High Quality Content by WIKIPEDIA articles! The Southeastern Greyhound Lines (called also Southeastern, SEG, SEGL, or the SEG Lines), a highway-coach carrier, was a Greyhound regional operating company, based in Lexington, Kentucky, USA, from 1931 until 1960, when it became merged with the Atlantic Greyhound Lines, a neighboring operating company, thereby forming the Southern Division of The Greyhound Corporation (the parent Greyhound firm), called also the Southern Greyhound Lines.