Access to the platforms is controlled by ticket examiners who verify each passenger's ticket. This configuration limits access uniquely to passengers. At the time of departure, after all passengers had descended, the ticket checker would press a button that notified the conductor, through a green light on the platform, that the train could leave. The movement director in Wellington was also advised of the departure by a special light. The final decision of departure was the responsibility of the conductor, until conductors were replaced by a second engineer in the 1990s.