Task Force Interoperability (TFI)

An international working group of the National Safety Authorities (NSA) and the most important infrastructure managers of the Netherlands, Austria, Germany, Italy and Switzerland.

The TFI attempts to support the higher-level and long-term harmonisation of the Technical Specifications for Interoperability (TSI) with a practical and rapid "bottom-up" approach. The TFI therefore cooperates closely with the European Railway Agency (ERA) of the EU.

https://www.bav.admin.ch/content/bav/en/home/topics/cross-acceptance/task-force-interoperability.html