Project Profile: Copenhagen’s Sydhavn Metro Line (M4 Extension)

Copenhagen’s M4 Sydhavn Line extension is a 4.4 km twin-tunnel metro project designed to enhance urban mobility and regenerate the city’s southern harbour district. The project is a benchmark in modern urban rail development, integrating advanced tunnelling techniques with passenger-centric, art-infused station architecture. This profile details the technical specifications and strategic impact of this critical infrastructure expansion.

Technical Specifications

The core of the Sydhavn Line extension consists of 4.4 kilometres of twin tunnels constructed using two Earth Pressure Balance Tunnel Boring Machines (TBMs). This method was selected to minimise surface disruption in a dense urban environment. Each tunnel features an internal diameter of 4.9 metres and an external diameter of 5.5 metres, housing the track, signalling, and essential life-support systems. The project’s five new underground stations were designed with a focus on durability, passenger flow, and unique aesthetic identity. Led by Gottlieb Paludan Architects, the design integrates site-specific art installations, leveraging materials like textured pastel paints to reflect light and create spacious, welcoming environments, distinguishing each station as a unique public space.

Key Takeaways

• Strategic Network Integration: The M4 extension seamlessly connects the developing Sydhavn district with the existing Cityringen (Circle Line), creating a more resilient and comprehensive public transport network across Copenhagen.
• Advanced Urban Tunnelling: The project demonstrated the effective use of TBM technology to navigate complex subterranean geology beneath a major European city, setting a high standard for precision engineering with minimal community impact.
• Fusion of Engineering and Art: By embedding high-quality, permanent art installations within the station architecture, the project elevates the passenger experience and transforms functional infrastructure into significant cultural landmarks.

Frequently Asked Questions (FAQ)

When did the Copenhagen Sydhavn Metro Line open?
The Sydhavn Metro Line (M4 extension) was commissioned and opened to the public in the first half of 2024, connecting Ny Ellebjerg to the city centre.

Who built the Sydhavn Metro Line?
The main design-and-build contract for the Sydhavn Metro Line was executed by a joint venture of two leading European contractors: Vinci Construction Grands Projets and HOCHTIEF Infrastructure, with HOCHTIEF serving as the technical lead.