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2. Fundamentals of ERTMS
2.1 Use of a reference defined at European level
To have interoperable trackside and onboard equipment, it is necessary to have a common set of specifications that are sufficiently precise to guarantee that any ERTMS-equipped train can run on any track equipped to receive ERTMS trains. This is why the European "interoperability" directive (96/48) requires the use of a "subset class 1" reference for ERTMS (note 1).
In 2006, the official version of this standard was V 2.3.0. It is due to evolve slightly towards V 3.0, which will be mandatory around 2009.
It is therefore in these standards that we will find the fundamental principles of this new railway signalling system. The points described...
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