1.
Each of the subsystems shall be covered by a TSI. Where necessary, especially for treating categories of lines, hubs or rolling stock separately, or to solve certain interoperability problems as a matter of priority, a subsystem may be covered by several TSIs. In this case the provisions of this Article also apply to the part of the subsystem concerned.
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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.