The new S4

The S4 project from Hamburg to Bad Oldesloe

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Latest NewsInformation for local residents: construction work in February 2024More information

Opening hours in our S4-Info Train
Thursdays, 3.30 – 5.30 p.m.
Tuesdays for groups by previous appointment at S4 (at) 

More convenient, more efficient and more punctual 

Passenger numbers on northern German rail services have risen sharply in recent years, and the necessary mobility turnaround is expected to lead to even more people switching to rail in the future. To make this possible, the infrastructure at the Hamburg hub is being massively expanded
Passenger numbers have also been rising steadily for years on regional services between Hamburg, Ahrensburg and Bad Oldesloe. We are responding by constructing the S4. This new S-Bahn line will provide the region's inhabitants with better local transport between Hamburg and Bad Oldesloe. Some 250,000 people will benefit from this new service.

Opportunities and Benefits      Financing 

In-depth information about the planning process and our construction work

20 kilometres of existing line from Hasselbrook to Ahrensburg-Gartenholz will be upgraded for the new S-Bahn service. The project consists of three sections. Each of them has its own specific planning procedure, which means separate approval is necessary for every section. 

Our project diary

There's a lot happening when it comes to the planning and construction of the new S4. Our project diary keeps track of the latest developments and follows how the project is going. Members of the project team also provide details about their work so you know more about what's happening in the background. It's a mine of interesting information. Enjoy!

Friday, 26. January 2024

Visit from board member Ingrid Felipe during important track possession period






© DB InfraGO AG

On 18 January, our board member for infrastructure, planning, and projects, Ingrid Felipe, visited us during one of the most important track possession periods for our major S-Bahn line S4 project.

Friday, 26. January 2024

S4-Info Train now barrier-free

Barrierefreier Infozug

Pia Haskamp/DB InfraGO AG

The S4-Info Train is now barrier-free

We have great news at the start of the year! Since mid-November 2023, the S4 Info Train has also been barrier-free thanks to a specially constructed ramp, and as part of the construction of the S4 S-Bahn line, we will be equipping not only all new stations, but also tunnels and bridges with barrier-free access. Of course, our information train is also a must. It is now accessible to all visitors - regardless of individual mobility restrictions.

Wednesday, 17. January 2024

Integrated Project Alliance - Market Dialogue






© DB InfraGO AG

On 17 January 2024, we reached another milestone in our partnership-based implementation of the S-line S4. Following our market information in November last year, we have now entered into an active dialogue with many different construction companies. As part of our market dialogue, we have had intensive and constructive discussions about alliance packages and have thus taken a major step towards implementing the integrated project alliance. We would like to express our sincere thanks for the committed participation and the interesting input from the construction companies involved!

26.02.2024Construction site camera on section 1