"electric buses." . . "public transit." . . . . . . . . . . . . . . . . . . . . "Advanced Vehicle Testing Activity : 21st Century Truck Partnership"@en . . . . . . . . "Challenges and experiences with electric propulsion transit buses in the United States technical report"@en . . . "Challenges and experiences with electric propulsion transit buses in the United States : technical report"@en . . . .