Technical specifications for interoperability

Frequently asked questions, a catalogue of TSIs and a list of derogations (exemptions) and critical error solutions available in the United Kingdom.

• Frequently asked questions about technical specifications for interoperability
• TSI catalogue
• Notified National Technical Rules (NNTR’s)
• A list of notified bodies appointed in the UK
• Derogations, a list of all derogations (exemptions) applicable in the United Kingdom.
• Critical errors, a list of critical errors and solutions available in the United Kingdom