'The Capital City's Light Rail') is a planned electric light rail system crossing the lines of the S-train in Greater Copenhagen, Denmark, parallel to but outside the borders of Copenhagen Municipality.

It will go from Lundtofte Park north of Copenhagen to Ishøj station in the southwest, and it is expected to open in 2025,[1] with an annual ridership of 13-14 million projected.

Currently the rapid transit network of greater Copenhagen consists of a metro system serving the city centre, south-eastern suburbs and one western suburb, and a well-developed S-train network consisting of radial lines and one inner ring line relatively close to the city centre.

Since the suburbs along the radials are expected to grow, a better quality public transport solution between them will be needed.

[2] Furthermore, some high passenger volume destinations such as the Technical University and two hospitals are not yet directly accessible through rapid transit.