High Quality Content by WIKIPEDIA articles! The Great Lakes Greyhound Lines (called also GLGL), a highway-coach carrier, was a Greyhound regional operating company, based in Detroit, Michigan, USA, from 1941 until 1957, when it merged with the Northland Greyhound Lines, a neighboring operating company, thereby forming the Central Division of The Greyhound Corporation (the parent Greyhound firm), called also the Central Greyhound Lines (making the fifth of six uses of the name of the Central Greyhound Lines).