A central station usually designates the principal passenger railway station of cities which have multiple stations. The central station functions as the main transport hub for rail transport, normally with interchange with other modes of public transport. Certain services, such as intercity of high-speed routes make their only stop in the city at the central station, while commuter services may serve all stations in the city. A central station may be a terminal station, with all services ending at the station, or may permit through services. It need not be geographically "central".