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 risk control measures recommended by the JNS Network Panel following this accident, as published on 7 August 2026.

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The recommendations of the Joint Network Secretariat (JNS) panel, outlined in the final report, provide information on, amongst others:

  • Comparable wheel types, including BA 004 and others, in Part II, Chapter 1a.

  • Risk control measures for Entities in Charge of Maintenance (ECMs) on page 47 and onwards.

  • Risk control measures for Railway Undertakings (RUs) on page 55 and onwards.

  • Risk control measures for technical control and Function IV of ECMs, including workshops, on page 64 and onwards.

More information is available on the website of the Joint Network Secretariat (JNS).

Please note: this report does not meet the online accessibility requirements.