SBB Digital Interlocking Upgrade: Swiss Rail’s Future.

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Introduction

Swiss Federal Railways (SBB) has initiated a major modernization of its signalling infrastructure, investing approximately CHF 1.4 billion (EUR 1.5 billion) to implement a new generation of digital interlockings. This program aims to enhance the efficiency, reliability, and sustainability of the national rail network, with the first systems slated to begin service in 2029.

Project Scope and Contracts

The modernization program involves replacing 80 percent of existing installations over the next 20 years. Contracts for the supply of the new digital interlocking systems have been awarded to Hitachi, Siemens, and Stadler Rail. These contracts operate under framework agreements valid for ten years, with provisions for three optional five-year extensions, along with 25 years of maintenance and support.

Digitalization Strategy

SBB is advancing digitalization across its operations to increase capacity on Switzerland’s rail network. The introduction of digital interlockings is a key step towards a fully networked digital railway, which will feature driver’s-cab signalling, advanced traffic control, and real-time management of train movements. SBB stated that digital interlockings are central to the future rail system, enabling more frequent and reliable train operations, thereby increasing capacity and improving passenger experience.

Technical and Operational Benefits

The new interlockings will replace existing relay technology, some of which dates back to the 1950s, thereby reducing maintenance costs and complexity. SBB currently operates approximately 500 interlocking systems of varying generations. Digital systems will facilitate shorter train intervals through integration with cab signalling, where operational information is displayed directly to the driver. Furthermore, the new equipment will be modular and standardized, simplifying and reducing the cost of component upgrades.

Implementation and Procurement

The modernization is expected to occur in stages over approximately 40 years, with installations prioritized based on their remaining service life, customer benefit, and alignment with Switzerland’s cab signalling rollout. SBB anticipates that the new technology will ultimately reduce the number of interlocking sites required. The tender for the project was launched in autumn 2022 and divided into two lots, which include development, training, maintenance, and support services in addition to system delivery. Future orders for individual interlockings will be issued progressively according to the modernization schedule, with framework partners invited to bid for each phase.

Conclusion

Swiss Federal Railways (SBB) is modernizing its signalling infrastructure by introducing digital interlockings. The project, valued at around CHF 1.4 billion (EUR 1.5 billion), involves replacing 80 percent of the existing installations over the next 20 years, with the first systems expected to be in service by 2029.

Company Summary

Hitachi: A company involved in the supply of digital interlocking systems.

Siemens: A company involved in the supply of digital interlocking systems.

Stadler Rail: A company involved in the supply of digital interlocking systems.

Swiss Federal Railways (SBB): Initiated a modernization program for its signalling infrastructure.

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