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In 2017, ILF Consulting Engineers was awarded a contract for the detailed design services of Section 1.5 – Permit Application Procedure (contract section 4 South), better known as “Wolframstrasse”, by a joint venture consisting of the companies Kunz, Leonhard Weiss and Kurt Motz. This challenging section is an integral part of the large-scale project “Stuttgart 21”. It is an approx. 450 m long rapid transit railway tunnel, predominantly constructed using the cut-and-cover method, which constitutes the S-Bahn link from the North to the central station.

It is worth mentioning that about 100 m are to be constructed in an existing tunnel while keeping the railway operational. Throughout the entire construction period, two of the four rail tracks will be kept in operation. Additional challenges arise from the location of the contract section in the immediate vicinity of the railway station, from avoiding interruptions of traffic in Wolframstrasse, from construction works carried out in existing structures and from the low overburden of a sewer main that crosses the tunnel. To date all challenges have been tackled and the design services are taking place in accordance with the specifications of the joint venture.

After the completion of the construction works at Stuttgart 21, the entire platform area, the track area and the existing tunnel will be removed to make room for a new city district.