Greater Bridgeport Transit (GBT) is a transit service serving the Greater Bridgeport region of the U.S. state of Connecticut. Greater Bridgeport Transit was established in 1971 in anticipation of diminished bus service by the Connecticut Company, which officially ceased operations in Bridgeport in 1972. GBT provides local bus service to the cities/towns of Bridgeport, Trumbull, Stratford, Milford, Fairfield, Westport, Shelton, and Monroe. The fleet is composed of mainly New Flyer Xcelsior and New Flyer Low Floor, as well as Gillig Low Floor, three Proterra ZX5 models, and two Proterra Catalyst BE40 models, which have since been pulled from regular service for "unknown reasons".