Deutsche Bahn has postponed the principal commissioning of the Stuttgart 21 rail infrastructure project to December 2031 and raised the total cost forecast to €14.5 billion following an internal audit that revealed serious deficiencies in project planning, control, and risk management. The revised delivery plan was formally adopted on June 26, 2026.
Revised Timeline for Phased Commissioning
The revised schedule spreads project commissioning phases between 2027 and 2033. The Bonatz concourse at Stuttgart Hauptbahnhof will reopen with initial public access improvements in December 2027. The long-distance station at Stuttgart airport is set to open for regional services in December 2030. The rebuilt Stuttgart Hauptbahnhof is
planned for completion by December 2031, followed by the launch of a recontrolled S-Bahn link equipped with ETCS Level 2 and ATO by July 2032. The Stuttgart 21 project will conclude with the inauguration of the 11.5 km Pfaffensteig Tunnel connecting Gäubahn to Stuttgart’s through station and airport in December 2033.
Construction Deficiencies and Technical Challenges
An internal audit reported that digitalisation of the railway hub proved more challenging than anticipated. A technical building from 2013 became unsuitable for current requirements, and delayed adjustments to evolving power supply standards necessitated a full redesign. Construction defects include the incorrect installation of cable ducts, with over 1,000
km of installed cables and ducts needing replacement. The audit described control and risk management as seriously deficient. Time pressure led Deutsche Bahn to bypass some planning procedures and prematurely commission construction companies.
Management Changes and Official Responses
In response to the audit findings, Deutsche Bahn has reorganised the management team, appointing Klaus Müller as CEO of DB Projekt Stuttgart-Ulm GmbH on March 1, 2026, succeeding Olaf Drescher. DB CEO Evelyn Palla expressed strong concern over the audit results. The revamped leadership aims to identify resource bottlenecks early to reduce the risk of additional delays. The internal audit outlined serious deficits in project oversight across
multiple areas.
Project Scope and Network Integration
Stuttgart 21 represents one of Europe’s largest rail infrastructure projects, involving a complete overhaul of the Stuttgart rail hub in Baden-Württemberg, Germany. The project includes about 100 km of new track, 11 tunnels totaling 56 km in length, and 42 bridges. The rebuilt Stuttgart Hauptbahnhof will transform from a terminus to a through station with eight through tracks below the historic station building. A new intercity station at Stuttgart Flughafen Fernbahnhof connects to the city center via the Fildertunnel. The project supports the Frankfurt-am-Main – Stuttgart – München rail corridor, part of the Trans-European Transport Network linking Paris
to Bratislava. It also complements the Wendlingen – Ulm high-speed line opened in December 2022.
Passenger Impact and Legal Context
Deutsche Bahn plans enhanced rail replacement services including buses, standby vehicles, and passenger guides to mitigate disruption from ongoing construction delays. In 2025, a Baden-Württemberg court rejected DB’s appeal to share cost overruns with project partners, leaving DB solely liable for the increased costs estimated at an additional €3 billion beyond previous budgets. The project budget now stands at €14.5 billion.
