Until 1987, when Greyhound Lines acquired Continental Trailways (part of the Trailways Transportation System), there were two systems of intercity buses - Greyhound and Trailways - in Northern Virginia.
Prior to 1987, when Greyhound Lines bought out Continental Trailways as part of the larger Trailways Transportation System, there were two separate systems for intercity bus travel in Northern Virginia: Greyhound and Trailways.