Subway Entrance

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". It is often underground or elevated. At crossings of metro lines, they are multi-level. At street level the logo of the metro company marks the entrance of the station, along with the schematics of the services at the station. Often there are several entrances for one station, saving one from having to cross the street. In such a case, tunnels or overhead stations can often also be used just to cross the street. Control over ventilation of the platform is also improved, allowing it to be heated or cooled without having to do the same for the tunnels. The doors add cost and complexity to the system, and trains may have to approach the station more slowly so they can stop in accurate alignment with them.