On this page you can find the reports of the Joint Network Secretariat (JNS) about the incident with broken wheels in the Gotthard Base Tunnel and the wheel analyses that were carried out. The documents include the full impact report and the final findings of the JNS Network Panel following this accident.
Download in English: JNS Gotthard Base Tunnel – full impact assessment
Download in English: JNS accident in the Gotthard Base Tunnel – broken wheels – final report (version 4.1)
Download in English: JNS Network Panel – Gotthard Base Tunnel – wheel analyses (19 December 2025)
The recommendations of the Joint Network Secretariat (JNS) panel provide information on, amongst others:
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Comparable wheel types, including BA 004 and others, on pages 25 and 34.
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Risk control measures for Entities in Charge of Maintenance (ECMs) on page 37.
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Risk control measures for Railway Undertakings (RUs) on page 38.
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Risk control measures for the function IV of ECMs, including workshops, on page 39.
More information is available on the website of the Joint Network Secretariat (JNS).
Please note: this report does not meet the online accessibility requirements.