In Neuchâtel, the existing ZST 90 train control system on transN’s line 215 no longer complied with current Swiss requirements for metre-gauge railways. TransN therefore decided to upgrade the entire line, from Neuchâtel Place Pury Littorail to Boudry Littorail, to the modern ZSI 127 system. As part of this modernisation programme, transN commissioned Enotrac to carry out the implementation phase in the role of independent expert, in accordance with the Federal Office of Transport (FOT) directive on independent inspection bodies and the relevant applicable regulatory requirements.
About the project
The introduction of the ZSI 127 train control system on transN line 215 represents a major modernisation, replacing the outdated ZST 90 system, which no longer meets current Swiss standards for metre-gauge railways. This upgrade, implemented along the entire route from Neuchâtel Place Pury Littorail to Boudry Littorail, involved the complex integration of new safety components, standardisation of speed data, and extensive modifications to signals, interlockings and technical interfaces. Enotrac’s role as an independent expert was critical, encompassing verification of safety documentation, analysis of data consistency, inspection of installations, evaluation of test protocols, and support during commissioning. Despite challenges such as managing legacy infrastructure, the temporary coexistence of two systems, and the varied operating environments along the line, the project delivered a fully compliant system aligned with current regulations. The implementation of ZSI 127 significantly improves operational safety, reliability and precision, while providing transN with a robust and sustainable technological foundation for years to come.
Our contribution
Enotrac played a decisive role as an independent expert in the introduction of the ZSI 127 system on line 215, acting in accordance with the FOT directive on independent inspection bodies for railways, which sets the requirements for organisations responsible for assessing the conformity of railway installations. In this expert capacity, Enotrac applied the OFT directive for demonstrating the safety of railway installations, ensuring that all safety evidence was complete, consistent and compliant with federal requirements. Simultaneously, Enotrac worked within the framework of RTE 25100 on the demonstration of the safety of safety installations, which provides a structured approach for the analysis, verification and validation of control and safety systems. By combining these three regulatory frameworks, Enotrac reviewed safety files, verified the consistency of technical data, conducted detailed field inspections, evaluated test results and supported commissioning, ensuring that the final system fully complied with legal and regulatory requirements. Thanks to this rigorous, multidisciplinary approach, the project delivered a reliable, safe and sustainable installation that fully meets Swiss railway safety standards.
Facts and Figures
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Client
Neuchâtel Public Transport Company (transN)
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Period
November 2020 – May 2021
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Location
Neuchâtel, Switzerland
Our services in the project
