Article 5

1. Each of the subsystems shall be covered by a TSI. In the case of subsystems concerning the environment, operation or users, TSIs will be drawn up only to the extent necessary to ensure interoperability of the trans-European high-speed rail system in the fields of infrastructure, energy, control and command, signalling and rolling stock. 2. The subsystems must conform to the TSIs; this conformity must be permanently maintained while each subsystem is in use. 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. 4. The TSIs shall not be an impediment to decisions by the Member States concerning the use of new or upgraded infrastructures for running other trains. 5. Compliance with all the TSIs shall enable a compatible trans-European high-speed rail system to be set up that will preserve, as appropriate, the compatibility of each Member State's existing rail network.

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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.