SBB Expands Zurich S-Bahn with 9km Wetzikon Sidings

WETZIKON, Switzerland – Swiss Federal Railways (SBB) is assessing construction of new sidings near Wetzikon’s Binzacher site to support the Zurich S-Bahn 2035 expansion, requiring approximately 9 km of additional train stabling. The assessment is part of the 3.53 billion EUR Zurich-Winterthur upgrade, where construction has already begun and temporary schedule adjustments are planned from December 2026.

What Is the Full Scope of This Project?

SBB is evaluating new stabling facilities near Wetzikon to accommodate approximately 9 km of additional Zurich S-Bahn trains under the 2035 expansion phase. The Binzacher site, located near Kempten station, is one of the locations being considered and could be integrated into a mixed-use development with residential, commercial or other urban functions. Outside peak hours, some trains are temporarily taken out of service and operated with shorter formations, making stabling capacity essential to avoid empty runs on an already heavily used suburban network. The Municipality of Wetzikon has asked SBB to justify the location choice and demonstrate that other options have been considered because the area is already subject to major public and private urban development projects. Landowners in the affected area have been informed and will remain involved in consultation. The wider Zurich-Winterthur expansion also aims to introduce 15-minute service intervals for Zurich’s central S-Bahn network.

Key Project Data

How Does This Compare to Similar Projects?

The Wetzikon sidings assessment sits within SBB’s wider Zurich-Winterthur expansion, budgeted at approximately 3.53 billion EUR, while the specific stabling investment has not been disclosed. By comparison, Metrolinx’s five-year operations and maintenance contract with Alstom in Canada, valued at around 800 million EUR, covers 117,020 GO rail trips and 56,494 UP Express trips with over 97% on-time performance, illustrating the operational pressure facing high-frequency commuter networks that additional stabling must support (Source: Railway News, 2025). The global railway multiple units market also shows a clear shift toward high-capacity electric suburban systems, with the EMU segment holding a 72% share in 2025, driven by government investment in metro and suburban rail (Source: Precedence Research, 2025). Comparable data for other Swiss commuter stabling projects was not publicly available at time of publication.

Editor’s Analysis

The Binzacher site conflict exposes a recurring tension in Zurich’s rapid suburban expansion: infrastructure operators need land close to corridors while municipalities face competing housing and commercial pressures. SBB’s willingness to assess mixed-use development may reduce local resistance, but it could complicate rail operations if urban functions encroach on safety and access requirements. The global trend toward high-capacity urban rail investment—46% of the 2025 market share for metro and light rail—suggests land-use integration will become more common as commuter networks expand (Source: Precedence Research, 2025).

FAQ

Q: Why does SBB need new sidings near Wetzikon?
A: To stable roughly 9 km of additional Zurich S-Bahn trains entering service by 2035, avoiding empty runs on the heavily used suburban network.

Q: What is the cost of the Wetzikon sidings project?
A: SBB has not disclosed a specific sidings budget; the broader Zurich-Winterthur upgrade is budgeted at approximately 3.53 billion EUR.

Q: Has the Binzacher site been confirmed for the new sidings?
A: No, it is one of the locations under consideration. Wetzikon has asked SBB to demonstrate why Binzacher was chosen and to show that other options were assessed.