Article 4
The rail system, subsystems and interoperability constituents including interfaces shall meet the relevant essential requirements. The further technical specifications referred to in Article 34 of Directive 2004/17/EC which are necessary to complete European specifications or other standards in use within the Community must not conflict with the essential requirements.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.