A metro station or subway station is a railway station for a rapid transit system, often known by names such as "metro", "underground" and "subway". Such a station can be elevated, underground, or about ground level depending on the level of the train tracks. At crossings of metro lines, they are multi-level. There are entrances/exits at ground/street level, often with stairs or sometimes ramps or escalators leading to any elevated or lowered track level area. Follow the arrows.