1. List of subsystems
For the purposes of this Directive, the system constituting the Union rail system may be broken down into the following subsystems, either: structural areas: infrastructure, energy, trackside control-command and signalling, on-board control-command and signalling, rolling stock; or functional areas: operation and traffic management, maintenance, telematics applications for passenger and freight services.
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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.