The new S4

The S4 project from Hamburg to Bad Oldesloe

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More convenient, more efficient and more punctual 

Regional rail services between Hamburg, Ahrensburg and Bad Oldesloe have seen a steady increase in passenger numbers in recent years. 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!

Wednesday, 9. November 2022

Agile construction on the S4: DB optimises construction sequence with two steel bridges

Einhub der Brücken

Deutsche Bahn AG

The lifting of the bridges early Saturday morning on the S4 construction site

In order for construction to continue at full speed and for trains to be able to roll along the long-distance railway tracks without major closures next year, Deutsche Bahn (DB) is optimising the construction process for the S4. During a site visit in Hasselbrook today, Hamburg's Senator for Traffic and Mobility Anjes Tjarks got an idea of the creative solution - two 27-metre-long steel bridges. Until the actual structure over the freight bypass is built at the site, DB is using two bridges from its existing stock. Experts installed them in record time over the weekend with the help of a 700-tonne crane.

Wednesday, 2. November 2022

S4 presents innovative noise protection in Ahrensburg

Amina Karam & Michael Kablitz in Ahrensburg

Deutsche Bahn AG/Peter Mantik

General Project Director Amina Karam and Head of Planning Michael Kablitz at the event in Ahrensburg

Why do we need a four-track extension of the railway line? What impact will the planned noise protection have on the townscape of Ahrensburg? DB discussed these and many other questions with citizens and experts in Ahrensburg last Thursday.

After an hour of lively exchange at seven market stands, moderator Katrin Fahrenkrug welcomed the 150 visitors in the auditorium and a further 130 viewers on the livestream. After a keynote speech by IG Tunneltal, Amina Karam, General Project Director for S4, and Michael Kablitz, head of S4 planning, presented the project and details of the third construction phase.

Wednesday, 26. October 2022

Infomation event on the S4 in Ahrensburg

On Thursday, 27 October 2022, the town of Ahrensburg will hold a public dialogue event on the expansion of the  S-Bahnlinie S4 in the region. At the invitation of the town, we from Deutsche Bahn will be there with the S4-Projectteam at the Schulzentrum am Heimgarten. Our experts on planning, noise protection, the environment and archaeology will take part in a panel discussion.  

We look forward to welcoming many of you on site and to exchanging ideas with you. We will be happy to explain all the details of the project and answer your questions. All those interested who are not present can follow the panel discussion here via livestream from 7 pm. We look forward to your active participation!

More information on the event here.