The metro is owned by the Stockholm County Council and has three main lines and 100 stations, 47 of which are below ground. The first part of the metro was opened in 1950 after the light rail line which opened in 1933 was converted. It is also well known for its decoration and as been refered to the longest art gallery in the world.

There is said to be a ghost train that still rides the line The Silverpilen and it as been described as being composed of silver model C5 carraiges. There are different versions on when the train can be spotted one is that it is seen going at high speed through the tunnels after midnight.

Some connect the train with the abandoned Kymlinge metro station , which as the reputation of being a ghost station. There is a saying 'Bara de doda stiger av i Kymlinge' which means 'Only the dead get off at Kymlinge'.