3.

To the extent necessary in order to achieve interoperability of the trans-European high-speed rail system, the TSIs shall: specify the essential requirements for the subsystems and their interfaces; establish the basic parameters described in Annex II (3) necessary to meet the essential requirements; establish the conditions to be complied with to achieve the specified performances for each of the following categories of line: lines specially built for high speed; lines specially upgraded for high speed; lines specially upgraded for high speed which have special features as a result of topographical, relief or town-planning constraints; establish possible implementing provisions in certain specific cases; determine the interoperability constituents and interfaces which must be covered by European specifications, including European standards, which are needed in order to achieve interoperability within the trans-European high-speed rail system while meeting the essential requirements; state, in each case under consideration, which of the modules defined in Decision 93/465/EEC or, where appropriate, which specific procedures are to be used in order to assess either the conformity or the suitability for use of the interoperability constituents, as well as EC verification of the subsystems.

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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.