“…Inter-city train High-speed Train "Average" 1996 Vehicle (2) Large SUV in City (1) = Typical Load Factors When an aircraft is on the ground and its engines are shut off, support power is currently generated by a turbine-powered auxiliary power unit that is located in the aft end of the aircraft. During flight, electrical power for the airplane is produced by generators that are attached to the main propulsion engines.…”