Therefore, the ring line is currently two separate expressways, joined by regular roads.

This metro stop is where the green line intersects the ring line on the south side of the city.

Construction began in 1867 and the ring line was completed in 1877.

In the following years, the western part of the ring line has been put back into operation in stages.

The operation of the ring line was electrified in 1926.

Branches from the ring line have been built as follows:

In the first plans, Berg was meant to be a station on the new ring line.

Earlier timetables also had express services that skipped stops inside the ring line.

A second ring line, further from the centre than the existing one, has also been discussed.

It serves traffic between suburbs as a ring line.