M4 (Copenhagen)

The M4 (the Harbour Line) is a future expansion of the Copenhagen Metro connecting Nordhavn in the north with Sydhavn in the south. The northern arm was approved by the Danish Parliament in 2012 and is expected to open in 2019, while the southern arm was approved in 2015 and is expected to open in 2023.

Both Nordhavn and Sydhavn are former industrial areas situated at opposite ends of the Port of Copenhagen and currently undergoing urban renewal under the auspices of By & Havn.

The M4 Line will serve 13 stations. From København H to Østerport the line is shared with M3.

Stations on shared M3 section

Stations on Nordhavn section

Stations on Sydhavn section

In April 2017 it was announced that these five stations would feature artwork from five Danish artists: Superflex, Pernille With Madsen, René Schmidt, Christian Schmidt-Rasmussen, Henrik Plenge Jakobsen.

An extension in Nordhavn with 3 further stations have been proposed, with the possibility of extending the line even further towards Hellerup Station.

Two possible extensions from Ny Ellebjerg Station in Sydhavnen are being looked into. One towards Hvidovre and one towards Bispebjerg. To enable such future extensions from the current M4 terminus, Ny Ellebjerg, it was decided in 2016 that the station would be built as an underground station instead of overground as previously decided.

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Wikipedia