1.

Member States shall take all necessary steps to ensure that interoperability constituents are: placed on the market only if they enable interoperability to be achieved within the Union rail system while at the same time meeting the essential requirements; used in their area of use as intended and suitably installed and maintained. This paragraph shall not prevent the placing on the market of those constituents for other applications.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.