 In addition to the deadman handle and foot pedal, the trains are fitted with "task linked vigilance" - which resets a timer every time the driver activates certain controls.If there is no change in control, a flashing lamp and then buzzer sound and the driver is required to acknowledge a vigilance button.If the train's driver does not use the controls and does not acknowledge the vigilance alarm, the vigilance system is activated and makes an emergency brake application.